I'm a shop owner and I have customers bring their cars in to fix a symptom of the problem. I make it a point to let them know the cause of the problem before I fix the symptom.
Threatening service manager or the mechanic won't make things any better.
Regardless, if the shop is taking advantage of you or not. If you don't want them to continue working on your vehicle, just let him know and take your vehicle back.
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