Verification for enhanced levels on bittrex is very easy. A few days ago I verified my account to enhanced and it only takes 20 minutes of my account to be verified. Just tips to succeed, read and follow the procedures of them and everything will be fine.
With all the complaints I read in here about the verification in Bittrex, I thought it would take a month before I will be verified. Few months after the problem in bittrex about deactivation of some accounts, I decided to apply for Enhanced verification even though my account is not deactivated and still active as basic account. Anyway, I decided to apply few days ago and then was surprised to see that my account is already enhanced verified. I guess problems arise when you didn't input your information properly like being registered with a fake name. I hope though that those accounts that are locked will be able to unlocked their account in due time.