USBI review: 3rd party unauthorized billing added to a computer phone line

Noticed an odd charge on my Verizon phone bill so I contacted Verizon, they said we authorized USBI to add $17.99 a month for local/long distance calling. When I asked who gave them authorization they had no answer and said I had to contact USBI to cancel the charge. When you call USBI it's an answering machine that just states leave a message and we will return your call, they never did. I must have left 10 messages. Even after closing the Verizon account they were still trying to bill me for USBI. I figure this scam cost me over $200.00 and forced me to switch providers to end the scam. Verizon was no help and had no answers.