Gaadi.com — Handed over car to gaadi.com 10 months ago, they have sold it to end user, still vehicle is in my name

I sold my car to gaadi.com, which is the subsidiary of cardekho. Its been 10 months now and still the RC is in my name. I recently came to know the some one else has already purchased my card and using it since a month or so. The new owner called me and told that he is using the car and if something happens he is not responsible, because its in my name.

I am trying to get a genuine solution since the beginning for this and nobody is responding properly. The person in contact for me everytime says that he will update by EOD and doesnt comeback.

Now after try everything possible to reach out to people there, they are giving multiple reasons that file is missed in RTO/signature miss match is there, so asking me to come to RTO and sign.

First of all, the file should not miss, if its a signature issue, they should have intemated me well before. I should get call from end user and after he saying that he purchased the car, and me calling back and forth, they are giving reasons.
technically speaking, I have given all docs to gaadi and i am nowhere supposed to involve here. have to take my personal leaves, travel 800 km up and down just for a min work, Still atleast I am asking to reimburse my transportation charges, these guys are bargaining with that also! Everytime i call, they say they will confirm.

Totally disappointed.
Searching out for a quicker solution