I am able to buy, but not able to sell. eBay say I am connected to a dodgy account that was last active years ago. I am not connected to it - but must be some

I am able to buy, but not able to sell. eBay say I am connected to a dodgy account that was last active years ago. I am not connected to it - but must be some IP match or fingerprint from shared office or the like. Zero ability to feedback or get anywhere from eBay. The logic is rubbish as well, I am dodgy so stop me from selling... but fine to buy?! How?! eBay - sort your shit out.