Unable to cancel a data account which is month to month

<p>I have been trying for the past 3 months to cancel a month to month data service which I keep getting billed for.</p> <p> </p> <p>I have filled out the forms and sent them to the cancellations department. I was told there was no telephone number to contact them on directly and had to speak via the callcenter. I then logged case ********** 5, where someone said they would get back to me in 3 days. Its been about 2 weeks now and no response. </p> <p> </p> <p>I tried to follow up with the cancellations department and my email was rejected saying the email box was full. </p> <p> </p> <p>Someone please help and pay back my money!</p>