VERY GOOD AT BUYING CARS VERY BAD AT SELLING CARS

We Buy Cars are clearly very good at buying cars, but not very good at selling cars! We went into there Springfield Park facility in Durban 3 weeks ago and offered to purchase 2 vehicles. Since then it has been an absolute nightmare. They suddenly start adding all sorts of extra costs onto the offer to purchase such as Delivery Charges and extended warranty. We told them that we would collect the vehicles and don't need to pay delivery charges. We were then told that we had to pay this and we had to take out an extended warranty. Surely it's the buyers prerogative to pay for these extra charges should he want to. It's called choices and options. The paper work keeps building and the pushing around from pillar to post continues. I've never had such poor service when trying to purchase a vehicle from somebody.