Underhanded hidden costs on car purchase

Be careful when dealing with the secondhand sales people and manager of this branch of Barons VW Tokai. We negotiated the price of the car I was interested in buying, as well as the trade-in and finance. When all was sttled and agreed upon the price for the car I was purchasing was adjusted upwards on the final agreement in a sly way. It was obviously hoped that I would not notice. When I challenged the sales person (Keagan Coffen) and the sales manager (Ian Marais) they imp**** that I misunderstood or heard incorrectly. I cancelled the sale and walked away. This is not what I expect from Barons VW. Interestingly the gumtree add that drew me to the car was also promptly removed as it advertised the price we agreed on.