Received a response from the Rollbit team, attached below.
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As expected, it seems they are holding on to the fact that I can´t prove I never moved to the UK. To clarify, I never admitted to playing from a restricted territory as they claim on their email.
I am trying to find a way to prove that I never moved and that I still live in Luxembourg, but it they wont accept my employment contract and my utility bills (including residence permit and rental agreement), I am not sure what they would deem as sufficient at this point.
I would really appreciate any ideas, I will share my draft reply to them here later today.
Perhaps it's time to offer them what I proposed to you earlier? The random, two hours notice, video verification? If they insist that you're in London and there is no way you can prove you're still in LUX, such arrangement perhaps could convince them otherwise.