Bad service and misrepresentation

I bought a Audi A5 cash on 26 October 2015. I took it for service in December and Audi indicated that the tyres were finished. I called the sales consultant and told him about it and that im very disappointed in them selling me a car knowing that it's tyres are finished. I requested the roadworthy certificate but it ess not sent to me they delayed why i don't know. On the 14th of January i took my car to tyger wheel and tyre for flat tyre they told me that all four the tyres were finished. They said i could not drive like that. I immediately called the dealers again the consultant never called back or send me the roadworthy certificate. I told then i only drove about 6000km since i bought the car abd the tyres are finished that's not on. I requested the roadworthy certificate again. The owner then said they'll pay for the new tyres. They got quotes sbd so did i. The ones i got was about the same price all of them for the 4 tyres. He got some cheap quote which i don't understand because the place he got quote from gave us similar price as others. Now i said he must courier these tyres he says no o must fetch them in pretoria whereas i have relocated to Cape town. Disapp