Mahindra And Mahindra — Buy and sale of old vehicle illegally

Dear sir
My father had a mahedra pickup van(AS07C2748) which was sold to Ranjan Mandal notary, as per court agreement the buyer was needed to transfer the vechicle to own. But the buyer was not transfer the vechicle to his own and he exchanged the vechicle at Ashook mahendra dealer at tezpur(agreement copy attached) . The dealer again resales the vehicle to another party. When we got the information about the vechicle we approached ashook mahendra dealer regarding the issue but delear is not agree to transfer the vechicle. We are many times communicated with delear but not got a well response. I want to infrom you that how can delear buy and sale the vechicle without intimating the RC owner. 2ndly if vechicle is involved in illegal activity who is responsible. Agreement copy between Ranjan Mandal and delear is attached here with for you information
Regards