First of all no need to tense so much.Regarding maintenance if girl want divorce then according to law she is not eligible for maintenance.you just prove in court she want divorce then you donot need to pay maintenance.
you can got divorce on the ground of cruelty.but there is question of maintenance just appear in court hair good lawyer.and prove in court that girl want divorce so you did not need to pay maintenance and got divorce also.
regarding filling of case
read below but there is already case is filed so there is not so useful
Section 19 in The Hindu Marriage Act, 1955
19 Court to which petition shall be presented. Every petition under this Act shall be presented to the district court within the local limits of whose ordinary original civil jurisdiction
(i) the marriage was solemnised, or
(ii) the respondent, at the time of the presentation of the petition, resides, or
(iii) the parties to the marriage last resided together, or
41 [(iiia) in case the wife is the petitioner, where she is residing on the date of presentation of the petition, or]
(iv) the petitioner is residing at the time of the presentation of the petition, in a case where the respondent is, at that time, residing outside the territories to which this Act extends, or has not been heard of as being alive for a period of seven years or more by those persons who would naturally have heard of him if he were alive.]