Jiffy Lube tried to do that to me 20 years ago. Went to get an oil change on my lunch break and something inside me said to check the oil when I got back to work. Pulled the dipstick and dark brown, almost gritty oil. Cleaned it off and checked again, same thing. Climbed under the car and checked the filter and it was dirty with road tar etc. They did absolutely nothing.
I went straight back and dragged the manager outside to show him and he tries to tell me the dirty oil is normal, that's how you know it's pulling the crap out of the engine
I say "Last time I checked, I didn't have any t!ts so don't talk to me like I'm a broad. Get back under there and change the effing oil!"
When he was done I made him give me my money back as well.
Those places are nothing but a bunch of scumbags
