I'd called about a service once and the guy went through a whole speech he was given. I was interested, but was still shopping around and wasn't completely thrilled with some of the terms he offered me. I thanked him and told him I'd call back if I decided to go with him. His response?

"Don't f*cking call if you're not willing to spend a little f*cking money. What a waste of f*cking time." And hung up on me. I can understand that he was probably working on commission or had a quota to meet, but I had his name, so he could get credit if I called back. That kind of attitude and service though? I never did.