I had 30 cents off a gallon coupon from shopping at kmart. Tried to pay for my fuel with a credit card and they said they couldn't get them to go through. Tried two different cards. Finally paid cash. Turns out they went through and then they refunded it back to my card. I think they were hoping I would leave and not use my 30 cents off. I usually do not have cash on me. Who can I complain to.