I can tell you this is bad situation and i need to take legal action because this is a mayor volume that got hacked!
If you can help or advise it would be great! I'm offering 1 BTC for the person that can help me restore my coins!
regards!
It seems highly unlikely that Bitrefill could have done anything which gave them access to your bitcoin.
More likely your computer is infected, and thus they were somehow able to get to your trezor when you connected it.
If you've really lost a significant amount of money, I suggest you try and contact some experts who can physically look at what the culprit is.
I doubt you'll see your money back though.