Back in 2013 and sent 7 bitcoin to Bitstamp and almost no activity since and now they have frozen my account asking for payment slip etc. for 2013. I told them several time I do not have dokumentation that old, but they keep asking.
Does anyone have similar problem with Bitstamp?
How did you got those bitcoins?
Can you sign a message from the address you sent them?
Back in 2013 7 btc probably wouldn't be worth not even 1000 usd. Maybe a signed message can solve the issue. Something like
" I am FIM3, I sent 7 btc from this address to bitstamp in 2013"