Well, I personally don't think that Bittrex is a scam.
Rising of popularity of the cryptocurrencies causes a huge flow of the newcomers.
Based on that we can surely assume that the number of support tickets at Bittrex has increased tremendously over the past few past months.
Even though i am also having a user verification issue - Request #483003, I just think, that they need some time to process all these tickets.
There are many examples of people having theirs tickets solved.
On the other hand, I would expected someone from Bittrex to give an official announcment that they are indeed working on improvents of their support system.