A complete false FIR filed against me. Having all the evidences.

My x gf filed FIR against me with the help of her mom and dad. she havent told her parents the real story. The FIR has 8 sections. 323,354(A),354(D),385,500,504,506,509. 354(A),354(D), 385 are cognizable offences where rest sections are of non cognizable. i have proved to police that it is complete false FIR. but her parents are saying i am fooling police or i am showing altered or edited evidences. police believed my evidences as they arent fake and hence they did not arrested me. FIR is filed in the end of may month. today is 31st december but police still not submitted any reports to the court. police told me that they will file C summary instead of chargesheet and will send case closure report to the court with the help of my evidences. its been almost 7 complete month since the case is still in police station. i heard that chargesheet or closure report must be submitted within 90 days from the date of FIR is filed. i dont understand what police is doing. police have supported me till now but dont know what is going to happen next. now police are arranging the meeting of me and the complainant in the senior police inspector office. i dont understand what police are thinking. if anyone has any idea about this pls share your review. now what to do if i want to take revenge against her and to cover my money loss in this matter : 1.Can i file return FIR against her? 2.Which sections will police count if i file return FIR against her for putting false FIR on me? plus her father stolen my mobile from me. plus i belong to schedule caste and she abused to my caste. i have evidences of this as well. 3.If the court accepts police closure report then will i have to quash the FIR under 482 crpc section? 4.Can i put defamation case through court if the court accepts the case closure report and can i ask the court to cover up my loss of money from the complainant? 5. Is there any role of complainant if the police file C summary and submits the case closure report to the court. 6. Can police or court take legal action against complainant for putting falsified FIR on someone? 7. If in case, i file return FIR on her for putting false FIR on me what would be punishment for her?