I've had some dealings with their corporate side as well. Particularly, their accounts receivables dept. I could not make them understand that if I paid with a debit card, there was no way I had a several hundred dollar balance. Turns out after a couple of years arguing with them, They had some manager stealing from them. How he did it with debit cards I dont know. I was never double charged on any of my visits. The toughest part was getting it off my credit report.
I do not do business with them anymore. No way I would stick a machine in there.I get my oil changed at a dealership now, and I do have a machine in there.