So, it was not an interview I sort of got to interview them (which was cooler than I expected!)!
I think we'll be hearing from them soon, they pretty much have a list of admits already, as far as I understood. And be certain they wouldn't make an international call just for you (or anyone else) to interview them (well, at least I wouldn't think so)! So don't worry, and good luck!
Quick secret: I am international too, it's just that I went to college in the US, so I am here and have an American phone number .
Also, what are you guys' interests? What did you apply for?