Dishonest people Hyundia Weltervreden

Good Day my name is Melissa and I need assistance in June I traded in my Hyundai Accent at the Hyundai Weltervreden for a Nissen Qashqai and within the same week my problems started, as soon as the engen gets hot the car started making sounds and I addressed this with them they fetch the car and return the car back 3 days later saying its all fixed now the next week I was driving on the highway and the car just lost power I called them and took a picture of the warning I got on the dashboard and they said to me I should bring the car back that the turbo packed up.. I have been waiting since then if I don't call to ask for an update they just not interested on not honest, last week I decided to call Nissen myself to find out what the actual problem is and I was told by Jacky the service consultant that they are waiting for authorization to fit a new engine. she has informed then management team from Hyundai and yet they never told me this. I have told them I don't want a car back that engine is being replaced and they should give me something else. this is upsetting yes they gave me a loan car but I am paying for something I don't have. please assist me. Darren and Tienie from Hyundai is of no help.