I could be totally wrong but I have a feeling that the "third party" Rollbit is talking about is not about the KYC verifier, it's probably the odds provider who requested for the account to be locked while they do an investigation. the OP mentioned after I asked that he didn't request for withdrawal but he was asked to perform KYC just right after winning $50k+ from betting on sports.
This is not entirely true, I have placed 2x $250 bets on spain winning which resulted me in winning $1250. When I woke up I got KYC'd and completed level 3. This was completed and all was fine, I then did a $180 sugar rush which paid $33.000, immediately after that I was asked for a level 4+5 KYC without making a withdrawal. I then played some blackjack while awaiting my pending level 4 and 5 KYC and ended up with a balance of over $60.000 when asking in global chat how long KYC takes because I had been waiting for over 9 hours, after asking this my account got muted. I then had a gut feeling something was not right and started doing $10.000 bonus buys resulting in me losing over $20.000, in which they disabled my account.
I have emailed them at
legal@rollbit.com currently still awaiting their response, I don't know what's going on but this all looks very shady to me.
When I get home I can upload images of these chat messages with support of them saying I'm KYC'd verified and disabling, re-enabling my account.
To clarify, and re-reading your opening post, you have completed the KYC process, they've accepted the documents you provided and your account is marked as successfully passed them? Or is it still on process?
If it already passed their KYC, the betting history as you described should shed us some light and matched with Razer's explanation, that your account is currently being investigated following a big win on Sugar Rush.