Unless I’m misunderstanding what you’re trying to say. 

They are unprofessional, have gotten angry and yelled on more than one occasion for minor misunderstandings.

However, it is not required if you paid the service provider with a credit card.Did I misunderstand something? 

So, what am I missing or misunderstanding here? 

Sooner or later, there's going to be a misunderstanding, the tenant is going to feel that you are ungrateful and unresponsive to his needs, when he has shown you nothing but gratitude and a giving heart, and your honeymoon will end.

first I’m hearing of that.Sorry for the misunderstanding.

Or am I misunderstanding something?

Am I misunderstanding somewhere? 

I might be misunderstanding, but that doesn't make any sense to me. 

Cause I just bought the book and I was getting a little confused and thought maybe I’ve been misunderstanding it.