Increasing initial advertised price TWICE

I found a vehicle on their website, 2010 Polo 1.6 comfortline, selling for R115 000. I call to view the car the next day, and the price has changed to R139 900. The SAME day I view the car, the price goes up AGAIN to R144 900. I email them back asking why the price has changed, they so it was a mistake on their part, however this is the price that alerted me to the vehicle, their compensation is a full tank of fuel + 2 new tyres. Unless those tyres are made of GOLD, I can not see that costing R29 900.