the question is,did you send your coin to Bittrex while you're having an unverified account ?
if you did not do that,it would be best for you to create another one.
but if you sent it to them i think the only way to solve it is by sending an email.
7 days are not long enough in my opinion because if you ever do some research you will see that someone got the reply from them for a few months.
which mean they're totally busy and do not have a time to reply your email(lets be positive).
try to send an email from day to day to follow up your case because i believe they will reply your email just like other.
keep trying and ask them from their social media and email