warning: Scientology. Do NOT give any personal information, they are trying to sell you something, will lie saying they are trying to correct their mailing, etc. Tell them to cease and desist calling the number they just dialed. probably won't. Keep a log of each call, date and time (don't answer after initial request to cease).
Then report it to the FCC at: http://esupport.fcc.gov/complaints.htm?sid=&id=d1e37
Caller ID: 813-699-5100
Caller: Scientology
This is Scientology, and they won't stop calling, although I've registered with the national do-not-call list and reported them previously. Please report them at the link jaylo listed above!