billing me for insurance when I dont have insuranc

I canceled my insurance with mtn on the 6 june and they are<br> still billing me. I phoned in and was transfered 4 times and no one<br> could help me, I just kept getting transfered. I held on at accounts for 30min and had the phone<br> put down in my ear. All I want is my money refunded to me but mtn doesnt even know which department<br> can advise me to get this done. I am now struggling and wasting my time and money for a mistakr mtn had made. Mtn is the worste!!