Portfolio Recovery Associates, Inc. Rip Off Artists USA, Internet

While still living in one town, I was contacted by Rip Off Artists USA on my unlisted phone # telling me that I owed them $7000.  I asked them  how I could possibly owe them this money because I did not owe anyone any money. 

They told me that I owed for a credit card.  I told them I did not have any credit cards.  They said it was a credit card from 1999.  I told them first of all, that bill is way over 10 years old and they couldn't collect on it even if I did owe it.  They mentioned the name of the credit card company and I told them I never had any credit cards with such a company.  They insisted I pay it immediately, and I told them they weren't getting a dime for a bogus credit card debt, and hung up.

I moved shortly after that and some how they got a hold of my cell phone number and called me.  I asked them how they got my number and they said they have their ways.  He said "I insist you pay this $7000 immediately so let's just take care of it right now".  "I said this is how we will take care of it", and hung up on him.  I immediately called my cell phone company and was told it would cost me close to $5 extra a month to put a block on my phone.  I told her it would be worth the extra to have peace from these rip off artists.  I was allowed up to 30 blocks and went online to find all the Portfolio Recover Associates I could find and blocked everyone of those numbers.  So, now, the only way they will be able to call me is if they use their personal phones.