More Verizon and Debt Collection

I've written in the past about Verizon and their debt collection practices. They're back again.I got a call this morning about an old disputed cell phone bill. The caller said she was from NES. I'm thinking this is Nintendo calling trying to sell me a Wii, but no. NES stood for something else, National something Systems?So she tells me this is about my "debt" of $473. She tries to intimidate me