We never did business with this company. They sen...

We never did business with this company. They sent a collection letter to an address I haven't lived at in over 2 years. No idea how they received my info but quoted a reference to an account with a payment processing company I did use, but that account was closed, my business was closed. We settled everything with the actual company we were using. Now, THIS company is saying that I owe THEM money and told me that they don't believe a word that I'm saying to them otherwise. When I asked to speak to a manager, she said, sorry, I am the manager and hung up.