stop billing me

I called during the month ofAug asking them to suspend my account as i had lost the device but i will continue paying till my contract ends in May, instead of the agent educating me that i will need to call again for cancallation they didnt so i was still debited, i sent and e-mail during the month of May, no one responded, and im still being debited again since May, i called the call centre and was not really helpful either, said they stoped ti but guess what? IM STILL DEBITED