Cardekho — RC

I sold my car to CarDekho on March 19 2022 on the understanding given by CarDekho that RC transfer is done within maximum 180 days from the sale of car to CarDekho.
Contacted customer care multiple times on RC transfer status however, till date my complaint is not resolved.
Moreover, I was told that new buyer shall renew the insurance but the insurance of the vehicle which was getting expired on Nov 22 has been renewed which means vehicle has already been sold to someone.
CarDekho is playing with innocent customer for minting money.