I had a letter this morning from SLC saying I was overpaid by nearly £4K in 2011. They say they wrote to me about it in 2012, which is sort of true. In 2012 they wrote and said I'd been overpaid by more (about £8 or 9K, I think). I queried it and they said they lacked some documentation I should have sent. I'd sent it already but I re-sent it all and (iirc) they then revised down the amount they said I owed. I again queried it and after a few letters exchanged I never heard from them again.
Now they are saying I have to pay it at once, debt collectors, 'persistent refusal to pay' etc etc. I haven't got that kind of money spare and I really don't think I owe it, but it was a long time ago and I'm not sure I have all the paperwork (letters, bank statements etc) I would need to prove it. It's certainly not to hand as I have a lot of stuff in storage atm.
I literally have not heard from them in all this time. There's no likelihood of correspondence gone astray as I haven't moved house for donkeys' years. Can they do this? Is it reasonable to write to me in 2020 and say they (think they) overpaid me in 2011 and I have to pay it back? Even the Revenue don't expect you to keep records this long!
Any advice would be gratefully received.