Though I can't vouch and say with similar degree of confidence I'll say when it come to certain several other casinos, as I barely in touch with Duelbits's staff, I think it is still safe to assume same situation are "enforced" upon them as what enforced upon the staffs of other casinos I am in touch with, namely they are not allowed by their corporate to speak on a record what is not provable, in case the situation got escalated to court room and the same evidence they said they have and/or provide are asked and/or checked by experts.
So, is there a possibility that could explain "the two people" situation? Someone else walking into the room? You're sitting with your roommate durirng liveliness check? You shave your beard and dye your hair pink? Help me understand this by walk me through what you can remember when you perform KYC.
There is nothing that I can think of besides trying to do the liveliness test on different IPs/devices. I do not remember what I looked like when I did it lol. If you want a fuller picture on Duelbits, you should take a look at their thread:
https://bitcointalk.org/index.php?topic=5279042.10720. Similar actions have been taken against other users as well who have been winning tournaments on Duelbits. They are also much more senior on bitcointalk. Even if you don't trust me, you should trust those members who are trusted members of this forum who have had very similar things happen to their accounts, although their accounts weren't banned, at least not yet, but remember at first I wasn't banned either. Given everything that's happened recently, I don't think you can put Duelbits on the same level of trust as those other bigger casinos you are in contact with.
On which part of my post exactly hinted to you that I don't believe you? All I'm asking is a help to recall your situation when you performed the KYC, in hope that it might help us understand how they come with that accusation, which was proven to be right by the ADR.