I feel like walking out of my job because of this

My cases is really different.

My ex and I adopted two children even though I didn’t want to do this. One night 2 years ago, he attacked me, when I came back from the polic station he had done a runner with the children…long story short, we have since divorced, the local authority would not take the girls back into care and ex decided to take in the girls. This is where tge problem starts… We did agree an amount each mouth, which I paid with cash throug the letter box, then one year later I had a bill if the csa, saying I owed £2.800. they took money direct from my salary with no prior warning which included an arrears payment. I have asked for evidence on how they came to this figure which I have constantly denied, the response back was that they take the word of the parent who opens the case and not the paying parent. After numerous calls etc I gave up and carried on paying, however on the 9th of January I received a call from a social worker to say that the girls were taken into care and that my ex was on police bail.

I contacted the csa that night to inform them but was told I was making it up and until the ex contacted them directly they could not take my phone call seriously. Every 2 weeks I phoned them to ask them what decisions they had made in terms of the maintenance payments stopping until the children were placed back with my ex… The csa have carried on taking payments from salary every month since January. Every month I phone them and I get tge same response that they have contacted tge ex and that the children will be going back to him any time soon.

I in tge meantime contacted the social work team and asked why they had not contacted the child benefit people to stop his payments, they duly did this, the ex now has had the child benefit and working tax credits stopped. I informed the csa but still they have not taken what I have said seriously.
The plot thickens even more, tge ex is waiting for a sentencing for a custodial service that will happen on the 12th of may, the children will obviously not be going back to him any time soon, especially if he gets sentenced for 6-9 months. Today (25th April 2015), the csa have come back to me and said they are not willing in any way to either close tge case in the interim or for me tp oh the minimum £5 a month until tge children are / should be placed back with the ex (he is being sentenced for a using the children)… Once a payment is taken from my April salary it will mean I would have paid 5 x months csa payments to someone who does not have full time care responsibilities of these children, technically I am rewarding him for what he has done. Tge children are in the care system currently being looked after by foster carers… I will be putting an official complaint into the csa who are hiding behind their legal team who are saying that a child in care is classified as being in temporary accomodation and tge period of temporary accomodation can be for up to 12 months. Until this duration is up they are telling me I have to carry on paying my monthly payments.

My question:

1. How can I be still liable to pay the full amount when the main carer is no longer tge main carer 2. Why will they not give me evidence as to how they come to the original arrears calculation 3. If I cannot get away from the arrears, surely tge 5 months I have had deductions from my salary when tge children gave not been with my ex them these deductions shoukd be taken off my arrears and any credit given back to me 4. How do I stop this deduction from coming out of my June pay 5. If child benefits and working tax credits have ceased why does csa have to continue Help!!! I am at my whits end and feel like walking out of my job just so I don’t have to reward this monster any more from what he has done to these children, surely this system is not fair