Lesson learned - not your keys, not your coins. if you leave coins at an exchange, it's on you.
Yes that should really be a golder rule to be honest.
I said on many occasions and reiterate the point, the only time your coins should be in an exchange is when you need to trade. As soon as the trade is complete send them back to your desktop wallet.
This Gold Rule is very late for many like me as I lost some good amount and now losing all hopes as time is running out its look like its never happen again so from now will use this never keep any coin on any exchange for safety otherwise you have only depression and lost.