This made you cautious. But 20 minutes later, you get another phone call from a customer wanting to put you through the same thing. Unfortunately, some business owners allow owning a business to go to their heads. That's why it's even more important to stop and think again. If you allow it to go too far you could lose your business entirely.
Egos are a very tricky thing to deal with.
Rage does nothing but tear you up emotionally inside and always erupts in bad behavior and lost relationships. Never, ever, go into a rage over the phone. Rage is truly the result of an unstable personality trait. It's really NOT normal. Perhaps some of you reading this are laughing inside yourself.