You do not have a choice, you're bound to give them your document, unless you want to donate your bitcoin to them. I particularly suggest that you deliver all the documents, respect their rules, even if they may not be good. If you can withdraw your bitcoin, then you choose whether you want to continue using the exchange or not. In some cases people are not able to verify their accounts
I did give them the infos, all of them. And believe me that was the smartest decision of my life. ( one of them at least ) .
A couple of weeks ago, I realized that Google terminated my Gmail account without any possible appeal ( repeated YouTube copyright infringement ) I believed that sort of thing never happened, so I was mortified and powerless to say the least.
Basically, I was locked out my Bittrex account + 2FA. Nothing I could do about it, of course Google had bigger fishes to fry, and I don't blame them.
People like to shit on Bittrex customer support ticket system / reactivity, so I guessed I was in for a long trip. I was wrong.
I have to say that they DID make things right, and they were VERY reactive. ( first response within hours ).
I sent all the documents required, selfie + ID, last balance, recent trades, last login IP's etc... and they unlocked my account within a COUPLE of days.
Thank god I fulfilled their enhanced verification process in the first place, otherwise I do not know how they would have identified me.
Their willingness and quickness to solve my problem -compared to other user's testimonies- might be due to the fact that I have a very old account and a quite hefty balance, but either way : I am pleased and impressed with the way they helped me sort this out.
Hope that helps someone .