Conspiracy Theory

I believe my family is conspiring to make me crazy. For your assessment:

My parents, being unaquainted with all things computer, asked me to discontinue the dial-up internet connection my sister had established for them. Why they asked me when it is my sister who has been managing/paying for the account I do not know. I asked my sister if she would discontinue the account since she is the one being billed, but she felt it would be easier if I took care of it since I had access to a notebook in which my mother had recorded her user name--consisting of her first initial and last name. Ok, I can see that is tricky information, I'll be sure to reference the notebook when I call.

I called and supplied the account holder's name--my mother's--and her telephone number. So far so good.

Operator: "Please tell me the last four digits of your mastercard."
Me: "Uh, I'm not the one paying. I don't have a card number."
Operator: "I'll have to verify with the secret question. What is the birth city of the account holder?"
Me: "Uh...Tokyo?"
Operator: "That does not match."
Me: "Saitama-ken?"
Operator: "No."
Me: "Yamanashi-ken?"
Operator: "No."
Me: "Wait! I'm doing this for my mother, I can't remember the name of the city where she was born!"
Click.

I called my sister, "I couldn't answer the secret question! Where was our mother born?"
Sister: "Sacramento."
Me:  "What?"
Sister: "I put Sacramento because it's easier to remember."
Me: "What?"
Sister: "That's where I was born."

Aaarghh!