How can they just open up a new case for the same child?

Been paying my ex for a long time now, was on the very old system, she tried to migrate it on to the new system but I managed to contest it and stop it.

I had a nil assessment although I did have arrears. Been paying arrears for what seems like forever. Anyhow last February had a letter from the CSA saying that the ex had split from her new hubby and that there was now a claim in against me.

I contested this as I had a case already for my daughter. My daughter who was 16 then was just getting ready to take GCSE’s. I argued for a while with them, telling them that my daughter was going to be leaving school and education soon and could they prove to me that they had a case against me, also asked them to find the case that I was still paying and as it was by DEO I had nothing to do with it.

I heard nothing from them since June when I asked them to get proof. Anyway, the DEO still kept leaving my salary as usual up until November. I thought, well that must be to do with 6 months after her leaving school or something. I hear nothing from the CSA until 1 week ago, nearly a year on, now saying that I owe them a £2000 odd pounds in arrears for the last year and that i am liable for £200 a month going forward.

They state they have informed my employer to take £400 odd pound out of me a month for the next year or so. I do not know what to do?

I cant afford £400. Are they right and can they do this??

Any ideas? I don’t know if my daughter is still at school. I know she has been accepted into Art and design this year but I have no idea what she is studying. Does she have to be studying a levels in order to get this.

Any help would be appreciated.