BestChange should intervene.
They responded twice, see
Janyiah's feedback:
Admin BestChange.com June 30, 2022, 20:14
Hello!
We request the exchanger's administrator to respond to the user's complaint.
Best regards, BestChange administration.
Admin BestChange.com June 30, 2022, 21:47
Hello!
There is no mark in monitoring about possible verification because verification is not carried out at the exchange service.
The situation with your order is another, the funds from you were not received by the exchange service and were frozen by the exchange, which requested verification, because the funds have the status Stolen 100%.
By creating and confirming your initial order, you have agreed to all the terms and conditions of the exchanger. The rule 7.7 of terms says about situations with frozen funds.
Verification is one of the most common and effective ways of following the AML and KYC policies.
In this case it is not possible to resolve this situation without providing the requested information to the exchange office.
None of this makes sense: if funds are stolen, sending documents to an anonymous website isn't going to change that. But they say they'll return it after receiving documents.
Note that the feedback has been bumped 48 times: BestChange allows the exchanger to cancel the claim (this happened 20 times). Then, Janyiah can renew the claim (which happened 19 times). That alone is very shady: imagine if any user on Bitcointalk could turn their negative feedback into neutral just by clicking it.