At least you should report them to the UKGC
https://www.gamblingcommission.gov.uk/public-and-players/complaints
The way they are processing transactions, as non gambling, removes any consumer protection, and I guess they might want to protect the UK gambling license as much as possible? I am not sure though.
But I would say this falls under one or more of these.
money laundering concerns
suspicious activity
unlicensed gambling or criminal activity.
Maybe they can at least get on Altpays ass and hassle them, even if it doesn't mean you will get any money back.
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