CSA enforcement demand

I have received a demand for payment enforcement order from the CSA. This is not the first, indeed it is the third. The problem I have is that they keep switching locations and sending demands for maintainence that has already been paid.

I have provided evidence of all payments made – both through the agency and volentarily, yet still get demands for sums they claim as outstanding or unpaid.

I have already made his issue know to the then minister of the DWP in 2008 and find two years after in 2010 and again now the same demands for money. I am frustrated by the empathy of the CSA agents and the general incompetence when it comes to finding documents that they have had over and over again to support my case.