I have been in touch with Betcoin directly, and gotten this solved. My e-mails had apparently gone to their spam-folder hence why they didn't answer. Thanks to Betcoin.ag for taking this seriously and contacting me quickly here in DM on the forum, and allowing me to withdraw the balance.
So, you managed to withdraw all the $15K, or they let you withdraw only the deposit?
It would also be nice to know what was concluded. Was your account still considered part of the syndicate, thus permanent ban from using their services, or you were found innocent?
Yes, I withdrew the entire balance of $15K. And money has arrived to my wallet. The conclusion was that they found a significant risk that I would create accounts on other identities, hence locked my account so they could speak to me and warn me. Issue appeared of course when there was no dialogue at all due to my emails arriving to their spamfolder. But was quickly solved last night when we spoke with each other on DM here. We didn't necessarily agree with each other, as I had no intention making more accounts. But apart from that, I'm just happy I got my funds out.