76 review: Gas pricing

I live in Whittier, Ca. and frequent a 76 gas station at 8803 Painter Ave.
Whittier, Ca. 90602 on June 30, 221 and the price on the kiosh showed $4.29 for the regular gas I used my 76 credit card and it proceeds to tell me their lowering gas prices when I begin to fuel my car it reads on the price as $4.39 I go in to report it to the attendant on how he is cheating customers into thinking their getting a good gas price he proceeds to tell me it's the credit card company that puts the prices. I was upset and called in which they credited me a dollar but my complaint is that 76 gas stations should make sure they are advertising what they are charging.