Facebook complaint: Account hacked, business manager hijacked, losing money every day

My personal account was hacked into on November 9th and through that the hackers added a new user, LINA1, to our business manager account who spent around 2,000USD on ads that have also gotten one of our pages disabled. I have made some progress in recovering my personal account (hackers no longer using it) but due to FB’s broken system of 2FA, I am stuck in a loop unable to actually get into it. Meanwhile we are unable to get control of our business manager or kick this other user out of it.

My personal account still has full controll on the BM, but I cannot access it. This LINA1 user still has full control of the account. Our colleague, Richie, only has partial access so he cannot add or remove any users.

I have had to cancel the card associated with the ad account and am unable to add a new one until LINA1 has been removed and can no longer spend our money. Facebook has not provided any help at all with this. The only solution FB has offered for this so far is for me to regain access to my personal account and from there I can remove the user myself, but they are offering no help with this apart from sending me the same links to recover my account through their broken system of ID verification, which keeps rejecting my photo ID submissions.

We are losing money every day by not being able to run any ads or manage our account properly, at the most difficult time of the year for tourism businesses.