Ring, Ring, Ring

I got a home phone when I moved into my new house. I haven't had a land line in about 6 years. I haven't given out this home number to anyone. I don't have voice mail and I'm not home very often. I prefer that people call me on my mobile. So why do I get 4 calls a day? From the same "Toll Free" number? Anyone know what or who is calling from 866.819.5368? If you figure it out, let's call them 4 times a day.