India Post — RC book returned but not traceable

RC book of my car was returned due to unavailability if anyone at home in Mira Road (E), Thane on 22 May 2023. I went to RTO Office, Thane on 31 Aug 2023 to get the same as it should have been returned back to the RTO Office. RTO Office directed me to the Thane Head Post Office who further informed me that the parcel is still stuck at Mira Road post office based on the online tracking.
Mira Road post office have me an absurd answer that they don’t maintain any records beyond two months and that they are not even able to trace it.. this is so ridiculous that I ended up eating my entire day to get such an irresponsible reply. There does not seem to be any accountability at all.