Rto India — buyer has not registered the vehicle in his name

Address:

Vadodara, Gujarat, 390020

I sanjeev kumar sell my motorcycle no. Gj06jl3581 in november 2017 to mr. Tanzil. I handover all the documents to mr. Tanzil for vehicle registration but he didn't registered it and sell to another person. Two month ago. I have also made a affidavit with another person. He promised me for registration of vehicle but buyer not yet registered the vehicle in is name. What can do