On the iPhone, look at your recent calls. Click the blue circle with the i in it on the right of the number / call you would like to block; this opens the Info screen about that call. Scroll to the bottom, click Block this Caller. (this is how it works on the iPhone 6; guess they are all the same/similar).
This number belongs to Kimmel, Beach, and Fitzpatrick out of Kennebunk. They call themselves a law firm but they are really just a glorified collection agency. They will, however, sue you so if you owe them money, you might as well pay it now and save yourself the hassle of court!
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