Total Fuel Station Rosslyn, Pretoria.

I would like to know if this is legal, there are two Total fuel stations at the main fourway stop in Rosslyn industries. The filling station is at a main busy junction where there is a lot of heavy traffic count per hour, worse during peak hours. Main customers are truck drivers, delivery vans and local people passing the area going to work. My concern is that prices at these two Total fuel stations are so ridiculously high and that's absurd, just this morning I went in to buy R12- 00 Vodacom airtime but was told by cashier that it is now R14-00 !! Not only that, juices, ready cooked meals and other products' prices are suspiciously high, abnormally but because customers are desperate, they don't have any where to go at the moment they need something, owner is talking that unfair advantage. I still want to ask Vodacom if they allow their products to be sold at that ******* price. Can someone advise if this is legal ?