Absolute pathetic after sales service from Nazeer and Siya from Anglo Car Dealers Benoni

I bought a 2014 Mercedes Benz GL 350cdi from Siya at Anglo Car dealers in Benoni. I was told to sign the ABSA document 1st before they do the "finishing touches" as per our agreement, and the finance document was signed on the 5th September. I only received the vehicle on the 17th September, without the dvd remote( without the remote, the dvd wont operate) It was agreed with Nazeer, workshop manager to either fit 2x Michelin tyres, or 4x more affordable tyres(i suggested Dunlop) and I will pay in the difference( which should have been about +/- R2500 or so. Difference between 2x expenseive tyres, and 4x more affordable tyres).They couldn't get the dvd player working as well, and told me that they need to order the remote. He told me (on whatsapp) that he will advise me when he have the remote, and then I need to pay the difference on the tyres which I don't have a problem. Currently he refuse to get me the remote(which I don't think he have) and told me to pay R6000 difference on tyres 1st(which was not agreed). I have signed their delivery note, which I have indicated on that they owe me the remote. They also refuse to send me a copy of the delivery note( Siya and Nazeer). They received their payment over a month ago for the vehicle from ABSA, so they absolutely don't care about their customer's request. So many whatsapp messages between Nazeer and myself, and Siya (apparently in charge of the sales) and myself, and with no success. absolutely pathetic after sales service, from a RMI approved dealer/workshops manager. They don't stick to their arrangement, and a lying to their customers, once the customer signed the documents.