Cars24 Services — Non availability of documents after sale

I sold my car MH03AM4132 to cars 24 mulund mumbai in Oct 2022 with valid RC and Insurance. Till today inspite of 100 calls or more and about 43 mails nothing has been done. No one is aware here of the documents to be given when a car is purchased from a seller. The whereabouts of the car is unknown to Cars 24 here. I have spoken to atleast 8 senior executives and no one responds after attending to calls and promises. I am going on abroad for vacation in about 2 weeks for 6 months