VERIZON Ruining my credit - blackmail to collect fraudulent bill. Nationwide

I had an account with Verizon since 2005. Over the years I swithched from their cellphone service to a competitive carrier but I retained my internet wireless service with them. As one of their early internet customers I had a contract that provided me unlimited wireless data and, as they moved to various plans I was always "grandfathered". They repeatedly attempted to change my contract by encouraging me to move to other computer access hardware but I never fell for it. 

Finally, they unilaterally sent me a new, and not necessary, wireless modem which I did not install. Suddenly I received a bill for one month's wireless in the hundreds of dollars. I immediately cancelled my Verizon account and picked up a Comcast one for a fraction of Verizon's new rate to me. Verizon said if I did not pay their fraudulent invoice the information would go to the credit bureaus.

I have not paid the single Verizon invoice and, when contacted, have repeatedly turned the matter over to my attorney and send a letter to Verizon and to their collection agencies explaining that the amount was fraudulently generated and that I have on intention of paying it.

All three credit reporting agencies now list this bill as in collection and my credit is compromised. I am not surprised that Verizon has thousands of ripoff reports here.