Elite mobile still taking money for cancelled account.

i had cancelled my account with Elite mobile allready in October within a day after I first received the call from their sales department because the phone they were offering were not big enough to handle the business. Although they accepted the cancellation and despite me having called them every month they still to this morning keep taking money from my account. this morning the call centre assistant put down the phone in my ear . I was angry but I feel I have the right to be and they make effort to sort out the problem