Social services

Looking for advice, Social services have admitted to failing us (us being 3 biological dads and 1 grandparent) Mother has 6 children 4 different fathers. I have alot of concerns about the case and the social worker is never available via phone and seems emails are being ignored, This is the 4th worker in 4 months (case is too complex apparently) Mother is facing cps ATM with categories that fall under non sexual child abuse. First concern dad 2 took his child to supervised contact at a school whom is bias with mother where when collecting the child found mother and dad 2's child unsupervised as the support worker had to step out. Grandparent at the same contact complained about all mother did was cry (mothers been pulled up on manipulating the children) when asking for notes/recording they were told they do not do this, also no signed agreement is in place for this contact i refer to sections 7 and 12 of supervised contact guidance. (Pulled from Liverpool site but assuming it should be the same in different areas in England as it a children's services manual). Next concern, initially a few months ago social services where told by the chair to seek LA (this was apparently not done as dad 1 put in a PSO and CAO) but has since been bought back up in conference to be done within 2 weeks (week 4 now) the SW said they want to combine all care givers court orders and make it public law (which would be much faster) Grandparent now has a temp CAO and PSO till jan. Dad 1 has a case in march (withdrew child using PR) Dad 2 and 3 advised to wait for social to do so. They have 15 chair recommendations in place now for 3 months that have been red flagged as none of it was done. The only reason children where removed in the end a few weeks ago was one child put a complaint in against mother yet mother scored a 1 all round in initial ICPC then second was 1-2. Next concern, Mother was meant to be supervised at all times by a family member, But started a new relationship with a stranger to the children who stayed in a room where mother and child where (yes this was unsupervised) but nothing was done and complaints not taken seriously. Before contact mother had not tried to ask dad's 1-3 and grandparent how the children where only offered money, dad 1 offered contact via social as dad 1's child only wanted to see siblings when in the care of mother. Dad 2 and grandparent pushed to see the children and mother denied this at every meeting using the excuse i was confused about social services advise ( advised 1 time for no contact with 1 party once, then 3 times to provide contact) she used confused as an excuse but put in a CAO PSO and non-molestation against dad 4. dad's 1 and 2 and grandparent want mother to have no part of taking the children to supervised contact as for reasons above + the CPS file going in where would they stand denying it? dad 1 feels social are not taking the children's first mentions of there lived experiences seriously yet all lead to Neglect ( including leaving children playing out while sleeping, underage child (13 i believe is the age to babysit 1 child) taking 4 others to a park within a 1 mile radius and the same child looking after all 4 whilst mother and ex was over 50 miles away for several hours. Abuse Manipulation Failure to keep safe Failure to seek medical attention Failure to provide basic medical needs (opticians dentist) also Failure to take all children to school. Mother claimed domestic abuse as the fact these things were not done (this has since been proven otherwise to us and social services but not taken into account in conference) Mother got out of the initial police investigation by claiming DA but the re-opened the investigation after obtaining information from devices removed from the house. Dad 1 has mentioned to dad 2 and grandparent about putting in a complaint against social services but unsure where to go with this as even the team manager refuses to pick up the phone and listen to previous complaints, all people who have the children now feel social services are withholding information from them none have received minutes form core groups yet all have requested them. SW seem very vague in what they want to tell us. We have since found out 2 out of 3 schools involved have formed biased opinions on dad 1-2 and grandparent and go against simple requests and setup contact out of hours within 2 weeks of children being removed off mother yet dad 2 and 4 have had no option before the children being placed with them. 1 of 3 schools never reported mother taking some of the children to school unsupervised yet would of had CCTV of this, yet the same school have an issue with dad 1 and grandparent talking with each other and helping take children to school (grandparent disabled) and even bought this up in a core group. Dad 2 told SW they do not want the child to go to supervised contact and child has expressed this (even tried to fake an illness to get out of school for the day) but school 2 have put in that this child expressed a wish to see mother. School 2 is also biased against dad 1 and grandparent. When grandparent had the court case for an emergency PSO the judge grilled the SW's team manager about several failures in the case. dad 1 dad 2 and grandparent want to complain but who do they complain to? how will a complaint look against them? how serious will the take it? dad 1 has had child for 3 months and has done everything possible to make SW happy even facilitated contact between siblings for a long term. SW has advised all current care givers to look at long term (till the children are 18) about providing them care. Where would they all stand in court saying no contact between children and mother? Mother manipulated 1 child that badly they believed the dad would go to prison for going against mother. 1 dad was point blank refused contact for years dad 4 refused since break up. Mother even allowed boyfriend of 2 months to threaten kidnapping and assault on all care givers. It has come to a point where the police and cafcass have been unable to talk with the SW  to gain information and this matches the other experience. Where do they go? what should they do? any advice is appreciated any law links/ social guidelines would be much appreciated