Does any one work for csa? Having major problems need advice :(?

We are in a similar situation and I am really sorry but sometimes they are like a brick wall. For 10 years we have had non stop problems with them. I have never heard of them not doing a re-assessment unless the PWC asks for it, I am sure that if he contacted them to say he was being paid more they would be quick off the mark to do it. You have to be persistent and record everything, phone calls, letters and keep writing to them and your MP. Write an official complaint to the CSA send it by recorded delivery, detail all the problems you have had. When you get a reply they should tell you how they can help resolve it (don't expect much as they ignore a lot of it and get down to the money they are demanding). You must give them the opportunity to resolve it so you have to follow the full complaints process. Once this has been exhausted you can contact the Independent Case Examiner www.ind-case-exam.org.uk who will look at it for you. I wish there was a quicker way but more often than not it takes forever. Keep on at them they can be the most unhelpful people but keep on. With regards to the arrears - did you ever get his ex to give something official saying she didn't want the money from him, if not you may find you are still made to pay.