This problem isn't just with Jiffy Lubes. We have a local chain in North Texas with a similar reputation. Additionally, they manage to flunk cars for State inspection for repairs where they can make money. Such a large percentage of customers OK the unnecessary repairs that it ends up being a very lucrative business for them.
I've been doing my own oil changes for over 30 years because a factory GM dealership did the same thing - charged me for an oil change that they didn't do. When I do my own, I know exactly what brand of oil and what filter goes in, that the oil change actually gets done and the the pan bolt threads aren't stripped or not put in tight enough. A friend of the family paid to have fan belts replaced at a lube place only to have those fan belts thrown off less than two weeks later, resulting in a tow that she paid for.
2000 Georgie Boy Landau 36' DP
2005 Saturn Vue toad