I know where not to take my S6 for work...

Had to take the S6 in for an oil change today (my single car garage is storing my passat with a non-op engine in it, so no space to do it myself). Took it to the first shop, and they said the drain plug threads were stripped, so they wouldn’t do the oil change and didn’t have time to fix the drain plug hole.
So, drove it to another shop, and they showed me that the drain plug and threading were fine, the other shop was on crack. Great. So they perform my oil change, and I ask if they’d be able to do a de-carb for me soon, and they said sure, that’s easy! Hmm, “easy”? Seemed suspicious, so I asked how they do it, and they said they disconnect the fuel line, and run cleaner through the engine. I said the engine is direct-port injection, the cleaner wouldn’t clean off the valves, and he argued and said sure it would… Well, 2 shops down, time to keep searching. Unfortunately, the only other shop in town that I had high hopes for is off the list as well - They quoted me $3000 to replace my chain tensioners in my Passat a few months ago. After taking the valve cover off myself, it turns out they just need new guides, which are $14 on amazon. Too bad my old Subaru shop doesn’t know squat about Audi’s, they were really awesome… oh well, the search continues. Anyone else have shop incompetency stories?