Cancellation : ****py Service

Been sending numerous emails since month end February to cancel with no reply ,called numerous times with no assistance, I called again today and asked for a call back as I was in a queue for almost 10 minutes ,I'm now told I have to pay for March though I never used their router then I can cancel and I'm advising the consultant that how is it my fault because you are the one's that haven't been replying to my emails and he tells me there's nothing he can do I have to pay before they can cancel!