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?
Keep your question! I have a small amount of these tokens in my ers20 wallet. I did not know that it was necessary to swap tokens for erc223. What should I do now?
I don't get your point. Can somebody just help me with this issue? I got proof that I possess and bought COSS and still own them.
Can somebody of COSS development team take their responsibility and explain me what to do now?
Is it so hard to give a little bit of service to a person who invested in COSS in the early days.
If I was part of a development team I would at least stand up and be helpfull.
I thought that HODL was the key.

If you hold the old COSS tokens on MyEtherWallet, please follow these steps to be able to see your new upgraded COSS tokens at MyEtherWallet:
1) Please log in to MyEtherWallet
2) From the right bar menu choose "add custom token"
3) Insert contract address: 0x9e96604445ec19ffed9a5e8dd7b50a29c899a10c
4) Insert symbol : COSS
5) Insert decimals:18
As long as you have the private key you should be fine, or the JSON file. Etherdelta does not hold funds.
Or you can perhaps use forkdelta, which is essentially the same thing as Etherdelta.
https://forkdelta.app/They have listed the COSS and COSSOLD chains, it should probably show.