Desperate for help please!

I have a balance on my seller account which I cannot disperse. I have tried to verify my account details, but in order to complete this process it wants me to verify some old account details which I don't recognise. I've called all banks I've used in the last 10 years to check, but none recognise the account number! I've opened numerous cases with Amazon, but they just get "transferred" and a day or 2 later I get a standard reply saying I need to verify my bank details. I can't see any way out of this short of filing in small claims court to access my money. Can anybody help please?