I got a call from this number last night and tonight. It is a call center for Dianetics/The Church of Scientology. Do not give them your name to take your number off the list - that would be providing them with additional information that they would otherwise not have access to.
I received a call where the caller's number is nearly exactly the same (apart from the last two digits).
Also, I have taken calls from the Dianetics people before so I'm sure they have my number. To come to think of it, it is the most likely explanation, in my case.