Bad service from edgars

So disappointed with edgars after I canceled airtime deal because I was no longer getting the airtime but they keep on deducting money from account for airtime that I don't receive. After I canceled successfully ithey stopped deducting for few months and start making deductions again I've been going to their shop prominade branch they just telling me is not in their control. I need edgars to sort this issue as soon as possible they cannot continue takingy money just like that.