Korean Stalkers

D and I are convinced (or at least I am) that we have Korean stalkers. Last Sunday, when we returned from church, there was a pamphlet with a post-it note stuck in our front door. The pamphlet was printed in Korean and the post-it note had Korean hand-writing on it. Then, this morning, we got a call from this guy who was speaking some sort of Asian language, which I am about 80% sure was Korean, and I just hung up because I didn't know what to say. Then, tonight, when we got home from watching the Super Bowl, I answered the phone and there was a woman speaking Korean (I think)again! This time I said, "I don't speak Korean, bye" and hung up. I'm not sure what to make of this, as we don't know any of our Asian neighbors, so how do they know where we live and our telephone number? Of course, they could be unrelated incidents, but I'm getting suspicious.