DWP brings up old files and ex sees opportunity to get more money

Old file has popped up to the dwp and they contactacted ex who run with 1 of 3 children 14 years ago and 2800 shows up as unresolved the poisenous dwarw sees cherries and tells dwp to get it for her i paid 1800 into account october 2002 she stole 1000 on my mbna card which is quits in my calculator  she admits to having the monies but is saying its her settlement and maintainence is still owed.