My bank account is not closed. What they say is that since August last year, I have had over NOK 300,000 paid in, and 130,000 have gone out of the account to unknown recipients. Now they want proof of where the money comes from. When I have made a deposit at the casino, I have used my bank card or Revolut, so they can see where the money has gone. I think they suspect something criminal
Ok, that's good news your account isn't frozen, and more likely then it's someone/some company you've transacted with, or received money from that has triggered this - i am only making assumptions, since every situation like this is individual, but normally if it was all about you then your account would be locked already.
If you can prove ok where 300K came from (wages, loans, casino winnings, etc) then it's not a problem - you'll probably be asked for loads of document proof but if your incoming funds are legit then all should be fine.
With regards the outgoing £130K, again I'm only assuming, but the bank will likely only be concerned about Revolut & the casino transactions because they offer potential avenues to siphon money away from original sources. As long as the same card was used every time and you're not scamming casinos into withdrawing to different accounts and the casino transaction history logs show all funds as being traceable & accountable, then again it shouldn't be a problem.
Same for any other 'unknown recipients' that they are querying - you may also need to ask these other companies for transaction logs to show the bank, but again, if you can prove incomings & outgoings all add up and funds sre all legit, that should be enough for them.
Plus, there's also a relatively strong possibility you've just been incorrectly auto-flagged somehow by the bank system - the fact it's not recognising established companies & labelling them as 'Unknown' could mean it's just made a mistake and requires clarification. Or it could just be because the location of where these companies are based is causing the banks system to flag it up - foreign based casino & financial services are traditionally always viewed with suspicion.
Although, at the end of the day, the reason why they're asking is irrelevant - the fact they are is all that matters now. The bank will never tell you, and satisfying their request should be your only concern now. Though as before, as long as you're innocent & can prove all your statement entries ok then i would assume you'll be fine, it may just drag on a long time.