Fraud at Jiffy Lube

My mom brought her car to Tire Kingdom and dropped if off one morning and went back to work. She went to pick it up after lunch and they had her car on the rack and both doors were open and the music on max. She through a fit because they were blaring the music and the cars oil was not changed yet. The manager said they would get on it and have it ready in a few min. After they were done, she checked the oil and it looked dark to her. She called over a young man that worked for Tire Kinddom and asked if he honestly thought it was changed. He said "mam I dont think it was". She went back inside and they swore that it was changed. She demanded they check and see if the filter was changed and sure enough it wasnt and they tried to rip her off. Ever since then if I bring my car to get the oil changed I watch them do it to make sure I am not getting ripped off like she did. I bet this happens all the time.