CSA want money from me but my daughter works full time

My daughter, whom i made regular payments for, started full time employment on 2/6/2010.

I stopped the payments and advised the CSA. I did this because i did not trust my ex wife to do it. However, the collections department have been on the phone telling me im several weeks behind and are going to arrest the money from my wages. I have given them the the address of my daughter’s employer.

Thanks.