Vonage Telephone Service

Purchased a Vonage phone line for my fax machine in late June 2008. My fax machine did not interface with Vonage's line. After several calls to the company's customer service & tech support, decided to cancel. They changed me to a "fax line". It also didn't interface with my fax machine. When I canceled the service (10/2008) I found out that they would not accept the return of the modem, plus they charged me a 39.99 cancellation fee (I was unaware of both), plus they cut the line with three weeks remaining on my already paid monthly bill and refused to refund me the last three weeks on the paid invoice.