Renault Underhanded Car sale

I bought a car at four ways renault in 2019 end of November and it was an older model a as they had said from the sales person a 2014 (which per contract is a 2017 model) model and was at that point out of manufacturing warranty and as such asked if I had an warranty and the sales consultant and finance lady which they agreed that I would be given one in the form of an extended warranty. I agreed to it and signed for the car including the extension on the warranty. The finance lady(Jane Makwa) three days before collection calls me to let me know there has been a change to the instment and it would be less by three hundred and everything would still be there including the extended warranty it's just the installment that would change, on the day I pick up the car I go to her we sign the new documents and I ask her if anything other than the installment has changed and she says everything is still as is. I take the car and am everything is well until I have to do my 105 000 service and I get told that my timing chain and clutch needs to be replaced I remind them of the warranty and get told that the car has no warranty on it. I was then told to call the warranty company and was informed that this was signed for and presented to them however there was no money paid towards it. I then go through my contracts with the new finance lady as the one that did all the paper work left the company and get told that I had refused the warranty and signed the new contract that had no warranty in place.. I inform them and show them my contract where I signed for it and was get told again that I had refused to get the warranty. Now I am told i have to pay 20 000 to get my car fixed and that I had signed the contract and that I was on my own.. I even told them that I spoke to the sales consultant ( Mr stay Ndlovu, whom is just as surprised when I asked him about this) and had my brother as a witness to all this and the conversation before signing the new contract. I called their head office about this but keep getting told to go to the dealership to have them sort this out and keep getting told the same thing that they can't do anything and I signed for the car as is. I am now stuck with a car that might have a breakdown anytime and have now to find the R24 377.80 to get my car fixed.