Unhappy client

Bought a cash car from a guy named Lawrence at their dealership it was saterdy afternoon upon our agreement he was gonna register the car for me and the rubber of the windscreen to come collect everything on Monday, when I got there Wednesday he changed his mind that he can't register the car since it needs 2500 I must pay for myself suddenlythats the trick he used I mean as a car salesperson one knows how much to register a car now its a surprise for him, and car parts said he ordered them till today I haven't gotten them, the car stil not registered because now I have to pay the arrears since the disk has expired January and he does not want to pay the arrears,I feel ******, his contact is ***