I dont know whether to feel pity for you or to join others to knock you because really, you deserves to be knocked. To have that kind of amount showed that you are not a newbie to the game and that alone tells you that leaving any of your fund on exchange site is a big no, no matter the convenience it might bring and that is where the issue comes in. Bittrex woke up one day and then disable all withdrawal unless you do your extensive KYCs and I guess its as a result of that was your account flagged for someone to have that amount of btc.

It even more annoying to see their response with so much effrontery on how creating additional tickets wont make your case faster in addition of not even giving a time frame to the end of such. I hope you can get it resolved and move one to another platform or even keep it in an offline wallets to avoid stories such as this.