Very bad after sale service

We bought a Chev Capriva from Anton at Royal motors Krugersdorp on 14 January 2016. In the first week I had to take it back and drive all the way from pretoria east to krugersdorp. Week 2 had to take is to GM in Bloem, where tey said the catalytic converter didn't work. Reported it to Anton. Took the car back on 9Feb. Anton wasn't there so Johan helped me. They only cleaned the sensors after the diagnostics showed the cat was faulty. Light came on again same day.Johan said they will order the part and get back to us. Nothing happened. Had to phone them after a week and half to find out what's going because no one is getting back to us.It's now the 20th and car not fixed yet, have to phone after them the whole time, now they are willing to fix it but not willing to give us a loan car leaving us withou transport and cannot give us a time how long it will take to fix..want to come and fetch the car tommorrow but no arrangments have been made with us as yet. They are very eager to sell the car but not willing to give the after service inside the 30 day warranty they provide you with. Think twice before buying a car from them. AVOID AVOID AVOID!!!