extremely bad service: "PTA North Exclusive"

i bought a Ford ranger double cab on the 03/07/2017 at Pretoria North Exclusive, which I thought was in a good condition as per the salesman. after driving the car for 2 months and 3 weeks,the car started to release a black smoke which was very bad. I contacted the dealership and adviced them of that. they adviced I can take the car to Ford motor company in Polokwane as that's cose to where I reside, so they can check it.they checked the car and said the injectors were faulty, I informed the dealership and he adviced that I should look for another mechanical workshop around there so they can check them properly, and also hoping they could charge the less to repair them. I did that and that company also confirmed that indeed the injectors were all faulty, the dealership requested a report which was then emailed to them and they argued that its not possible that all the injectors can be faulty and they said they would rather courier them to Pretoria so they can get them repaired. I suggested that I would drive to Pretoria to hand them over as I wanted my car fixed as soon as possible. the dealer agreed on that too,today t he 10/10/2017 I went to the dealer and spoke to Pikkie again who said the injectors looks old and have dust/rust, and he claimed that the injectors do not belong to my car. he said they are not going to fix them and I should see what to do with them. this is an extremely bad service I got and the Consumer protection act states that if the car gives me problems within 6 months I can take it back.