I experienced the same thing, they are very rude and taunting on the phone. if you call the number back, it's an answering machine with someone speaking in Chinese.

These people call once a month about my "upcoming move". If you hang up on them-they keep calling you-rapid fire. They are a despicable group of with apparently nothing better to do than reap vengeance on those who dare hang up on them.
Pitiful