Without knowing the current status of the maintenance case or any other case she has filed against you, it would be difficult to render any opinion in this regard.
You can collect the details or the copies of the petition filed before high court for seeking quash of the case pending in the trial court.
It is not understood that where is the sessions court involved in this crime.
As per your contents, it can be presumed that she might have filed a dowry harassment case under section 498a and section 3 and 4 of DP act through police and also a DV case directly and another case for maintenance under section 125 cr,.p.c.
For quashing FIR in 498a case, he should have approached high court, but where are the details, he is supposed to inform you the case details because it is you who has signed the affidavit for the same.
The fee what he is reported to have charged seems to be exorbitant.
But that his fee which cannot be commented upon.
However you can demand the details of all the cases he has filed on your behalf and the status of the case details of the cases she has initiated against you and also can terminate his services.
You are at liberty to engage the services of another lawyer of confidence.
First you obtain all the said details and then decide the next course of action.