Use cryptopia... Never had a big issue.. This is the best of all exchanges available for btx...
I invested £25000 worth btx through Cryptopia and everything was smooth and fine.... 💪✌️
so you should be in a big loss already, unless you had invested before 2017 crypto pump on dec.

it has happened to me, not same or close amount to yours, i am in a size of half of your investment in loss already but i wont lose my hope here and still think it can be a good coin for future