Dishonoring the transfer after full payment was paid for a Ford Vehicle from Ford Mossel Bay

Bought a Ford Transit 2 years ago Gideon the owner of this ford a VW refuses to give me a transfer after I have paid in full Over half a million rand. He also committed to transferring the vehicle to me and then didn't honor this commitment. He is also not honoring the agreements made by his DP and his salespeople, as they kept their word and honored what they negotiated.