change your number...thats pretty much all you can do.
wait no you can restrict your incomming phone calls by people only in your contacts. you have to actually go to your phone settings
actually...lol i had the same problem. i ended up finding out it was my little brother being a d!ck. if you go onto verizon.com go to the wireless section (if it's a cell phone) go to the my accounts. sign in. go to view my usage. then even if it's a restricted number it should show up on the actual bill. if that doesn't work go to your closest verizon store and ask them to print you out a copy of your bill, explain why and they should be able to help you out.
I know my parents had a problem with that, only the calls were creepy and harassing, they called the operator and she said because it was restricted she couldnt do anything. They ended up making a police report about it and the police called them back a few days later with the number (i dont remember exactly how it played out because i was really young at the time).... turned out to be someone we knew.... creepy. But i think Changing the number would be a good idea... it's not always obviouse to do so though....
if its a home line you can dial I think star 77 and it blocks all restricted calls.