False advert*****t of a Renault Duster

I enquired on a 2016 Renault Duster. At first i thaught they had great service because i got a instant replie after hours . The salesman said that he will send pics and a video of the car the next day. He did with my replie that i am in training till 12:30. He did call only to tell me that his managemet decided that the Duster is in too good condition to sell for the advertized price and that they are going to readvertize it for R10000 more and that i can buy it for the more expensive price. The price advertized was R149 k and they upped it to 159k. I told the salesman that i have a screenshot of the old adverizement and he said that i must come through to negotiate a price from R159k . I also have the conformation mail from Autotrader for the price i enquired on. This particular salesman changed the price on his facebook advertizement while another salesman have it on for the old price It is ********* and against the consumer law to do it the way the salesman handled it. I think the salesman made the decition increase the price as i wanted to buy the car cash which i told him .