RTO India — Car exchanged bit still registration refers on my name

Bought tata nexon car from Tata Treo, Delhi, bhikaji cama place in exchange of old tata indica vista no. DL3CBB3844..
Car still after 13 monthsif exchange refers on my name despite taking up with Treo Motors and Zonal officer.

There is no timeline by which exchanged vehicle must be transferred from customer name.

Request action of car transfer be completed.