Annoying Problem...not food related

I have a very annoying problem which isn't food related but I need to vent about it.

We keep getting phone calls every month sometimes a couple of times a month...a couple of times in a row...people calling us looking for someone who does not live here. How do I know it is the same people...caller ID...you have to think everyone in this day and age has it. I feel like the next time this person calls to go off on them...and asking (in a nice way of course) to stop call my phone number. The sort of funny thing is that person's phone number is one digit from mine. This makes me wonder why he is really calling my number every month.