Best/worst tech supports?

I have had multiple disappointing experiences with one of the big 3, so much so that I refuse to even call them now. Wondering if I just give off dumb hick vibes over the phone or if others have had the same experience. Not naming them in the main post because I don’t want to influence yalls comments. But I’m talking about I give them exact model numbers and they give me the wrong part number (multiple times to multiple techs, even after I called them back and told them it was wrong the first time). And there’s a couple reps that talk to you like you’re fucking brain dead.