My son was claiming tax credits, then stopped work, so phoned them to cancel tax credits. He didn't realise they were still paying him (he has Aspergers) but thought it was part of JSA.
Anyway, he is now paying is all back monthly but they have now decided to charge him for it twice! We can't convince them they are wrong so far. It is a lot of money, and I am completely fed up with phoning them etc. They are a complete shambles!