STILL being billed after canceling 7 months ago

Its funny how quick companies can sign you up for products but the same doesn't apply to cancelations. I had the getmore service active on a number that is used by a family member. Last year July I called to cancel the service and then active it on another number. today I decided to call and confirm that it is cancelled and guess what im still being billed 7 months later. as per the call centre agent \there is no cancelation request on the system\" so what did I call in for last year. The new number I activated it on I requested it to be cancelled in January its now April and it's still active.. there lame excuse is they tried to call but my phone went to voicemail, firstly that is ******** as I get sms notifications to say that I missed a call and also my phone will show I missed a call. If my phone \"constantly\" went to voicemail, why not leave a message saying dear customer we at getmore are trying to contact you please return our call. I want this issue resolved today and I want to be reimbursed for the 7 months that this service was active."