Bad after service just want the sale

I bought a TUV300 from Mahindra East rand mall in March 2020 just before lockdown started so I got the car and then I got home and wanted to lock the car it does not lock unless you hold the key by the window.I called the sales person Karl and reported it immediately to which he said he will let me know what will happen so then came lockdown during that time I started hearing a noise on the vehicle and also reported it. When lockdown eased down I took the car in to be checked they told me that the diff was broken but the warrety should cover it I was then told that they need to service the car otherwise the warrenty would not cover it. Then it came to when the car was repaired that I had to pay more than R6000 for the repairs , I dont think that all these thing should have been paid by me as I bought the car from them not long before it happened and they should also have serviced the car when I bought it and till today 11 May 2021 they have not fixed my remote to work properly and they also do not give any feedback when I email them about it I am so far gone that I want to sell the car again because of having to sruggle to get it open and close and cant afford to fix it out of my own pocket.