Pinnacle Credit Services fradulently reporting/collecting on a debt, been paid since 2008. St Louis Park, Minnesota

I had 2 verizon cell phones in 2008.  I moved out of the USA, Verizon does not exist where I moved in Europe.  I legally early canceled my contracts with Verizon.  3 1/2 years later I return to the USA.  I now have 2 phones again with Verizon.  Shortly after returning, Pinnacle Credit services began to call me trying to collect on the 2008 account.  I contacted Verizon, they said the account was closed and has a 0 balance and my current account with them is in good standing.  Verizon sent me a letter, I sent it to Pinnacle.  A few months later Vision Financial called me trying to collect for Pinnacle Credit Services on the 2008 Verizon bill.  I sent them the letter from Verizon as well. 

The people at Pinnacle Credit Services are always rude and unwilling to listen or accept the documents from Verizon stating that the account they are trying to collect on has a zero balance.  The supervisor yelled at me and threatened me that he will continue reporting on my credit until I pay them $550.00.  They continue to report on my credit monthly for a debt that does not exist and are damaging my credit score.