BRITS FORD - BAD AFTER SALES SERVICE

I bought a Ford Ranger 2014 3.2TDCI XLT 4X4 from Brits Ford 11 January 2018. The vehicle was delivered to me on 16 January 2018 at Mokopane. During our inspection on the vehicle I discover that there is no service book in the vehicle. I phone Pieter Prinsloo (sales rep) and he then only forward me a service history from the system. On Monday 29 January afternoon I open the (l) back door and then it didn't want to close. The lock of the (l) back door broke, I phoned Pieter Prinsloo (Sales Rep) at Brits Ford and his words to me was " what must I do, I am far from Mokopane", Pieter didn't even try to assist me. I drove to Ford Mokopane to assist, and the Service Manager said that they need to order a new lock but it will take 2days for delivery. For that 2days I couldn't use my vehicle because the back door can't close and I can't lock the vehicle. On Tuesday 30 Jan I said to Pieter that I want to cancel the deal on the Ranger because there is too many problems and issues that they don't attend to and when there is a major issue I will also get no service delivery from them. He said to me that he will discuss with his Manager (Steve Horn) and Steve will phone me back. I didn't get any feedback from Brits Ford. The only time I get feedback is when I call them, they will never call you back. Tuesday 30 Jan I also send a mail of all the problems on the Ford Ranger to (Kobus van Staden - Dealer Principal, Steve Horn - Sales Manager & Pieter Prinsloo (Sales Exec). They don't even try to adhere to the problems stipulated in my e-mail. On the 1st and on the 5th February I send a mail again but still no reply from Brits Ford. Please assist me with the way forward and what I can do as a client.