why not take legal action against Bitget? it's probably the best course of action you could take if they refuse to give you your commission.
Do you really believe than an "average Joe" has a chance against an exchange that is registered God knows where, and with millions of dollars and top lawyers at their disposal?
I mean, if everything about your story is real(I am not saying that you are lying or anything but you haven't posted any evidence supporting your claims) I don't really see any reason why they would not give you your commission.
It wouldn't be the first time that CEX/Casino/any centralized platform decides not to give you your money based on some bullshit reason and in 99.99% of the cases, you can't do shit.
They are cheaters !!! You are devoting ur life to their business and at the end you are in jail