I believe you made a very VERY big mistake, ser. You said,
But here I made the mistake to ask my friend Felix if I could borrow his ID and play under his name on a fresh account.
You made a new account claiming to be "Felix". That's not allowed, read the Terms And Conditions of the casino, or ANY casino for that matter.
Plus did Shuffle actually "promised" that they will return your deposit, or did you merely make that assumption?