False advertising and *****

I went to the petrol station to pour petrol and get some essentials when at a store I noticed that they have future life on special for R48.90 and when paying I was charged 61.90 I asked that it's on special why that price as the lady Thulis had swiped my card she then called the Manager Andile and he said I paid for what I get the speaicl is old I ask why is it not removed he said cause they use it to advertise to other customers