Cars24 Services — Sold the car but ownership has not changed even after 6 months

Hi Team @ Cars24,
I have sold the vehicle in the month of Nov-20 and it was agreed between us to have maximum 6 months to change the ownership of the vehicle.
Even today, the vehicle is on my name and i am getting the messages on the Traffic Violations.
This is absolutely not acceptable and requires your attention to this matter immediately.
Name - Nalluri Chandra ShekarVehicle Reg. No. - AP 10 AY 3114Hyundai Verna.
I have tried reaching out to your call center[protected], had a very unprofessional experience and was very upset too:Mr. Govind had come on call and when i said, i have sold the car, even before i say anything, i have to transfer the call and then he disconnects instead of transferCalled up again, Some gentleman taken the call and even before i explain the issue transfers the call to some ladyThis time, Ms Pooja comes on the call and she has all set of questions for me when i give my issue with her:I said, i sold the car and the ownership is still not transferred and due to which the traffic violation challans are generated and since my mobile is registered against the reg. no. i am getting the messages.She asked when did i get, i said one in Jan-21 / Mar-21 and now 22nd June-21.Now she gets into defending mode, why is that you have not called when you got the first challan, I said when you informed me that it will take 6 months time to change the ownership i waited, she started arguing as to why dint you complain then and now why are you complaining (boss its after 6 months also i am getting the messages and hence this call).When i started giving her back, she did not hesitate to disconnect the call on my face.
Pathetic experience and the worst thing that i could ever expect from any of the service industry (automobile). I am already worried that the vehicle is still not changed from my name and on top of this you btry ways to blame me for not complaining (common, what are the controls you have to see which all vehicles are crossing 6 months or more where you have taken over and not changed the ownership, do not you have the inventory to check, customer has to call and inform that 6 months are over after my sale now you check for changing the ownership???)