Just wait for a reply - there is nothing else you can do. If you want to hurry things, you could try to ask for support on their Slack channel.
This is a quote from an older "Bittrex disabled my account" post.
[...] They said it would take 24 hours or longer to get unlocked, but I asked nicely on the slack channel and they undisabled my account [...]
Get an invite from
http://slack.bittrex.com/ and then you log on to
https://bittrex.slack.com if you want to try it.
Yep, slack is good choice. I had frozen withdrawal. I messaged them via slack and they confirmed it quick.