Billing my account after contract termination

Terminated my Webafrica account, realeased the line for the new ISP, but Webafrica still debiting my account after I confirmed with them that the debit was cancelled. This is the 2nd month that Webafrica is debiting my account for services rendered, even though they are not services rendered. Called them again and excuse is that there was an issue with the system. <br> Taking my money is the only service that Webafrica seemed to get right when I used them, every other service was an issue, connection