Well I assume it's still the ERC20 token I possess else I would be able to send it to HitBTC. That means I've spent about $4000 in Ethereum at that time,
and now you are telling me it vanished for good? Or is there still an option to switch to the ERC223?
If COSS is another smart contract now and you purchased ERC20 COSS which has another smart contract maybe you lost your money, but it's just a guess, my opinion