G&M Chevron gas station Scamming gas station, never refund me the difference Westminster, California

My girlfriend pumped gas for $50. she paid outside using her credit card. when printed receipt shows $60 and shows "indoor prepaid." receipt shows $10 change was due see cashier for refund. she went inside to complain the clerk said it will automatically refund to her card in few days. 2 weeks later still nothing. It seems like a fraud to me. the only way to get the money back is to file a dispute with your c/c company. so much hassle for so less money.

Don't pump gas at that station anymore.  as a matter of fact I won't be pumping gas at G&M anymore.  after this incident forget that company.  I called the number posted on the window of the gas station which was for G&M complaining hotline and left a message they never called me back.  such a bad service.

Has anybody had the same problem?