this to be a telemarketer. It especially sounds like it if they are calling several times a day. This is how I deal with them. I create a contact labeling it as " telemarketer". On the contact page there is an option to "block this caller". Select "on" and your done. If you get other numbers like this calling you, you can ID with 1, 2, 3, etc.
Of course, you could use the same drill for any unwanted numbers.