Propert Issue Trace Pass and Fake POA

Hi, I have flat with joint ownership on mine and my father names. Also have bank loan against this property on our name. My father did not contribute anything but I have put his name for safety. Every month EMI amount gets deducted from my bank’s account. As I was working out of town for service, one of close relative had made TRACE PASS into my flat. When I asked, he had requested to give 6 months period. But now he is not vacating and claiming the ownership of the flat. We also come to know that he had made a fake back-dated power of Attorney (POA) of ours and got notarized with local lawyer. So I have filled FIR of Trace Pass and Fake POA against him. He got arrested but then got bail and staying in same flat. Still case did not stand as Police is taking lot of time to submit the charge sheet. Please guide me by clarifying below queries 1. How to get back my flat in shot period as I am staying in rented flat and do not want to spend years in courts. 2. As I have bank loan, so is there any way that bank will help me out? 3. What if I sell out the flat to someone else in a very low rate? Thanks in advance.