Raceway Gas

We got gas at lunchtime today and paid $15.00. Went in to get $3.00 because the guy had set the pump for $12.00 and refused to give $3.00 back, he said we gave only 12. but I have a ten and a five and had witness. I called later and ask why he was ripping me off and he kept insisting I gave 12.00. I have heard of other person complain and now I believe they cheat people. Again later I called hoping to speak to the older man and he told me to come in and tell him. We drove by this evening and lights were off at pumps and saw police car near there. I plan to go some time and let this man know about the young guy who cheated us. It's not the amount of money but they need to stop cheating people. Me and my family have been good customers for a long time.