I have the same question exactly.. i had my account since 2013.. they changed me from legacy unlimited, to 0.025 without any notice.. then from 0.025 to 0 yesterday.. This is highway robbery.
I am pissed! They got me yesterday too. I just withdrew a few days ago and tried to withdraw again last night after depositing to make a trade yesterday but it states that my account is "new." I tried to upgrade to basic again but it denied me. So, I went ahead and submitted all my documents because I was just going to withdraw and never give them my business again, but they still refused to give me my money. Support wont respond ---> I went through this with Cryptsy too and that didn't end well. I am pretty sure that Bittrex will be closing their doors soon ---> This is no small matter!