Also, for transparency, this is the email I just sent to them.
Just to address your points one by one, I am able to prove that I still live and reside in Luxembourg and I can provide rental agreement, utility bills, residence permit and even employment contract that will prove that I not only was living in Luxembourg at the time of opening the account, but I am still living in Luxembourg. I am also happy to share my utility bills for the months of June and July (when available) to prove that I am still living in Luxembourg.
The reason I do not use Wifi on my phone is that I spend a lot of time at work where the Wifi is capped (cannot access many sites such as youtube), therefore I always keep the Wifi setting off on my phone, given that I have unlimited mobile data anyways this has never been a problem for me.
Additionally, I would like to point out that allowing me to complete an exhaustive KYC will shed light to the questions you are asking and will clarify where I was when using the Rollbit account.
Very well written I think.
Also everything is basically explained good enough to at least make them hopefully look deeper into the whole thing. Refusing to see any evidence from your side would just look even more shady.
I mean what is the problem with hearing you out and look at the documents you are willing to provide, I really don't get it. They can't just judge and confiscate such a large about just because of their opinion it MIGHT be the right thing, it's ridiculous.
Hopefully they come to their senses and at least do the extended KYC, good luck for that!!