I called the number but didn't leave a message. I wouldn't be able to travel to do an interview, plus I am no journalist. I'm interested in what will be discussed in the interview but I just called to hear the message. I couldn't make out what was said though.

I thought about calling back a few times and making different funny voices just to pay the staff the compliment of free amusement! I was a little worried though that me calling back with different fake voices would be less amusing, and more annoying...

What could possibly be wrong with annoying them. I say go for it.

yes, annoy away. it only seems fair.