Cars24 — RC transfer for interstate

I have sold my renault duster having numbber AP29AY3999 to Cars24 in Telangana. Cars24 have sold the same to a person lived in Andhra pradesh and RC got transferred in his name in AP RTO. But in TS RTO car is still appearing in my name.

Informed the same to Cars24 customer care, but they said their job is over, RC got transferred. They are not bother about my issue.