Car deal misrepresented

On 7th October 2020,a sales representative, Mr Williams contacted me in connection with a vechile that would be an ineterest to me. I completed the relevant application and later that day, he messaged me to say it was approved and that he is brining the vechile and its purchase price is 150k the evening and the paperwork if I am happy with the vechile he has presented. I was happy and signed the offer to purchase. On Thursday morning auto pedigree got approval from the bank and Mr Williams contacted me to say that I can i have delivery of the vechile the evening and that I had to get insurance. Thursday late afternoon, Mr Melton contacts me and says that they amde a mistake with the purchase price and the car is in fact 160k in which I refused as this is not what I have signed. We at final stages and wanted to change the price which I refuse to accept. I then asked to speak to the Manager, Mr Robert, who was not very helpful saying that it was the sales rep mistake and that they can either give me another car which has more mileage and is not the same one that was presented. I then refused and asked to speak to regional manager. Friday morning I made contact with the regional manager, Mr Johan, who then also refused and said that the offer to purchase states it is a 2018 module and the one that was presented was a 2019 module. I then asked that he have a look what the sales rep had sent me which stated 2019 module and trying to tell me i do not have a ground to stand on which I then stopped him on telephone to give me a chance to speak, he then raised his voice, saying I have bad manners and that if they give me the car that was presented to me the sales representative would have to sign an acknowledgement of debt as it was his mistake. I then asked Mr Johan to please email me what he was saying and that I no longer want to deal with him over telephone. I then sent an email with all my facts and no one responded. Late Friday afternoon I receive a call from the sales rep, Mr Williams saying that they will give me the car but he must pay the 10k,however I have messages showing that management signed off on the deal for the car that was presented further for the 150k amount. I then communicated to Mr Williams that he will have to take this up with the dealership himself and i want the car at the purchase price agreed as this is prejudice to myself. No response from Mr Williams. Monday morning, 12th October I messaged Mr Williams for any feedback, no response. I emailed Mr Williams and included Mr Robert, no response. I then lodged a complaint to their complaints mailbox. The email entailed all the facts. The complaints manager responses stating they don't deal with complaints however sent it to the relevant parties, who was Mr Johan the regional manager. Thereafter I receive an email from the Mr Williams (sales rep) saying that they were in a regional Manger meeting all day and will get back to me tomorrow. Tuesday @12pm no feedback received i then had to email again to ask will I be contacted again as I want to take delivery. The manager, Mr Robert responses stating that they cannot give me the car that was presented to me because the offer to purchase stated Suzuki Swift dzire and the one that was presented to me was a suzuki dzire. Note the details on the offer to purchase was the vechile details of the car that was presented to me. I. E mileage,etc. I then communicated back to state that if you are saying my offer to purchase is correct but the vechile presented was a mistake then please tell me where is the car with the vechile details I signed. He then responds stating that only the car vechile name is correct but the vechile details are incorrect and cannot give me the car that was presented to me either the vechile details as to what I signed for.