They caught Jiffy-lube on hidden camera charging customers for a tranny flush and just not doing it, my brother had his oil changed at one and the next AM he found a puddle of oil under the car, they didn't tighten the drain bolt and it was hanging on by one thread. I'm not saying all JL's are like that but they are paying their workers $10/hr and pumping through as many cars as possible, it's good you found a local guy to work on your vehicles.
A Jiffy-Lube my grandfather went to years ago stripped the drain bolt on his rear differentials, causing it to leak oil. We eventually got them to refund the cost of a new OEM rear diff cover and drain bolt, and had our local mechanic change it out. I've never been to one of those places with my cars, and pretty sure I never will.
What y'all are describing is not at all uncommon with the quick change places, esp. Jiffy Lube, unfortunately.
My brother, an ASE cert'd mech. with about 40 yrs. or so of experience, routinely has an average of 2 Jiffy Lube disasters turn up at his shop each month. Blown/burned up engines is the typical disaster. Problem typically centers around stripped oil pan drain plug or not ensuring the previous oil filter's gasket was removed, giving a double gasket situation that allows the oil to blow out.
To their credit, JL foots the replacement/repair bill without much grumbling. John, my brother, says JL sees this as a cost of doing business as they pretty much hire people with no mechanical skills whatsoever, for the most part. Must be due to their low pay scale with, in turn, assures anyone with true mechanical aptitude/skill never work there.