I remember you came to me with this problem. On the same day, I contacted the technical support manager. They told me that they knew about the incident and that a special investigation was underway. Unfortunately, I do not know the details.
But I think that you are silent about something...
Although maybe I'm wrong. Believe me, this is not a mass case. It is unlikely that due to such a trifle as 15 ETH, without good reason, the Coinsbit exchange will risk its reputation.
There's literally dozens of similar complaints about this exchange on the web. Of course you are paid to only say good things about Coinsbit, so you would never admit it, but here, I've compiled a few of them for everybody to read on their own:
https://icorating.com/coinsbit/reviews/coinsbit-is-a-scamming-exchange-146237/https://www.reddit.com/r/Coinsbit/comments/cnls09/this_exchange_is_a_scam_do_not_use/https://www.publish0x.com/freecoin/beware-coinsbit-and-p2pb2b-xmewyehttps://www.youtube.com/watch?v=XdhoLqP1_-gFrom
Facebook:
Coinsbit is a scam. Please stay away. I have been trying to withdraw btc for over two weeks now and I have not received help, only responses meant to put me off. Stay away from coinsbit. I am experienced in the crypto space and Coinsbit communicates in similar ways to other crypto scams.
Also, the fact that they hired you to "bump" their otherwise ghost town of a thread suggests they are absolutely a scam, since only scam projects hire your "services."