Verizon review: I can't stop their services and subscription

I subscribed for the services of www.verizonfios.com, when they had sale on the website. As well as they offered free month of their unlimited Internet. I decided it was great offer, so I agreed to their terms and conditions. I paid for one month and the guy from the website promised to provide free Internet in the next month. After that these thieves simply started to take money for the services, but each time the sums were different and became bigger and bigger. And it seems that I haven’t received free Internet at all. Help me to stop them, because they haven’t replied to my emails.
USA, , NY 10007