I am the only one in my household that is active on casinos and never modify my IP adress. I recently started using a VPN to get access to other casino, but always switch it off when accessing other sites.
Offcourse, I only have 1 account also. Live chat is looking into it, but 2h later and I am still awaiting reply. Will update here, if I get a reply or if the representative of Duelbits on this forum, wants to look into it that would be greatly appreciated.
I am sure that VPN could be the reason why there were not sure about the situation at all. This is why I use VPN and still do not put in too much money. At the very worst case I would lose money that I earned, and the very best case I would lose my money gambling anyway. Never deposited any big amount to any casino because I use VPN, well also because I do not like to spend too much money in gambling neither but that is usually never the big case.
All in all, I have to say it is really not a big deal, it is basically just a protection system. I hope that your problem gets solved, we all know you and we all know that you wouldn't want to scam, it must have been a mistake for sure.