Dealership refusing to cancel my contract and replace my purchased car.

I bought a car from KIA that falls under the MOTUS group. Before I bought the car I had a few things that needed fixing and not all were fixed. After picking up the car I had more issues. knock from suspension, coolant warning light, and few things that I was also unhappy with. Went to the dealership and highlighted that I'm not happy with the car and I need a replacement car since the recent car I bought a few days ago has issues and is not convenient enough for me since these lots have to be fixed. But I'm being forced to take the same care that I'm not happy with. I have asked for another car seems like I'm pushing it. The pre-owned car sales manager was not calling me or keeping me up to date. The branch manager had to be involved and be the one speaking to me. But still, he is also forcing the same car on me. I'm looking for a replacement car this seems like I'm asking them to perform magic. I'm disappointed by the Motus group service. I bought the car from Audi Bryanston a few years back and they replaced my first purchased car that had issues and now here it seems like I'm looking for the impossible. To date, I don't have a car that I bought.