Cape Auto Traders Sold me a Mercedes Benz for R500 000 with Defective Airbag and a lot of other defects on the car, they never disclosed!

I bought a Mercedes Benz C200 in June 2020. I asked if the car was never ever involved in an accident and I requested a report for that, I was told it has never been in an accident. Then I purchased the vehicle. 1st mnth in my possession it showed a sign of a defective airbag later on, I enquired from them, they denied knowing the sign, I took the car to Mercedes Benz, only to find out the airbag had discharged previously, meaning the car had been in a major accident. Now I'm stuck with that unsafe car in my garage paying almost R10 000 a month, the car does not lock, Mercedes picked up that even the battery it's not the original battery, they tyres were worn out. My biggest mistake was buying a car in Cape Town whilst being in East London. The dealer is now giving me the run around refusing to take any responsibility for their defective car, instead this morning they are asking me why did I buy a car in another province? Can u imagine! My R500 000 is in thier pockets now so they don't care about this s**** they sold me. I am stuck for the next 5 years paying R10 000 for a car standing in my garage, as is I have been sent to pillar to post even by Mercedes Benz refusing to even order a spare key for this car, they are asking for the 2nd key which Cape Auto Traders is refusing to assist me to get. Now the car can't even lock because it went for the diagnostic test & came out with a lot of issues and now requires the 2nd key. I just feel like dying when thinking about the trauma Auto Traders has put me through the past few mnths!