English, Please

A caller with a very heavy foreign accent was wanting to use reward points to pay for his hotel stay. In order to look up the point information it is necessary to have the credit card number and a few other identifying information from the card.

Me: "May I have the credit card number that has the reward points on it." (We say this because some customers have multiple cards but not multiple point programs).

Caller: "You don't need that. Do you not understand? I want to use points."

Me: "Yes sir. I understand you want to use points but I need the credit card information to access the point information. May I have the expiration date on the card please?"

Caller: "No. I'm using POINTS!"

Me: "I understand. The way the point program works is we charge the card first and the points will be used as a credit against the total of the hotel stay, so I will need the credit card information."

By now he is really exasperated and yells at me,

"Am I not speaking English? What language am I speaking? Do you not understand plain English???"

I was so tempted to say, "yes, but I don't understand you!"