Ok, This douchebag collections agent has has been calling my home looking for someone who has a past due bill. For the last 2 months I have been telling them they have the wrong name, nobody here with that name..etc. They think i`m lying and that i`m the person they want. They refuse to identify themselves...and are generally unpleasant. So everyday they call to harass and bother me. So I finally broke down and paid someone to obtain the number they are calling from. Now its payback time. I need a really good prank. What can I do with the phone number to cause them the grief they are causing me day in and out?