Belof33

I was offered a discount of 15 cents per gallon at a shell gas station. I also had another 10 cent per gallon bonus that was to be applied to this purchase. When I got the cash back they changed the offer to 1 cent and said this was because I received 5 cents off for my shell card. The thing is I only received 11 cents per gallon back from upside when I would have received 25 cents had I not used my shell card. They say the maximum amount that would be deducted is the 5 cents per gallon but then how did it drop all the way to 11 cents per gallon? That’s lower then my original offer by itself,