Birch Communications Rude customer service attempting to collect $6,000 for 2 months of service Atlanta Georgia

My company closed its doors in July. I cancelled my account in August.  In December I received a collection call for $6,000.

The person on the phone was very rude when I asked why would I pay $6,000 for what should have been an $860 bill. (My service was $429 per month.) "She responded early termination fee."

I am not sure what they mean by "early" since i was with CBeyond for three years before Birch bought them.

I said that I was not prepared to pay $6,000 today or ever.

No effort was made to find out facts; no effort was made to resolve the issue.  She rudely said that she was turning me over to outside collection agency since I was not prepared to pay the $6,000 of extortion.