Best time when a defamation case be filed ?

I have purchased a house for making paying guest. Two students (relative each other) were verbally permitted to stay in my house in one room from 05 Aug 18 & given 1 set of keys. During end of Sep 18, they have been told to vacate the same and they were agreed to do that. When we visited my above house on 30 Sep 18, we have seen that their mothers were also staying alongwith them without our permission & all our 3 rooms and one kitchen have been totally stolen though found them locked outside except their one. We came to know from the neighboring people that with the help of these two students and their mothers, another lady has stolen all the domestic items. We immediately informed Titagarh Police Station all the matters & they came at 9 pm on 02 Oct 18, note down the witnesses, gone back alongwith under-custody of that two students and we were told to visit PS immediately. Accordingly when we reached the PS at about 10 pm, I have been brutally thrashed and badly tortured by the police (knowing that I am an Ex-serviceman) and kept me in the lockup and my wife was in the detention in the separate room. We even did not know the charges against us. The next day I have been sent through prison van to Barrackpore Court. After released, we came to know that we both have been booked U/S 342,323,354, 506 & 34 of IPC made by one mother of two students through written complaints at about 12.30 am on 03 Oct 18, which were totally baseless and false. Though I have processed the case with the higher level, I also wanted to file a defamation case against that lady, but our Advocate told us to wait for clearance from the charges first and then file a defamation case. However, I wish to file RTI also. Please help us, mobile No [deleted] & email [deleted]. Thanks a lot.