Poor customer service and ongoing debiting despite a settled account

My vehicle was settled on the 01/04. Despite my account being in credit, WesBank have double debited my account this month, creating serious financial issues for me. I have attempted to email and contact the call centre. I sat for over 2 hours waiting for my call to be answered. When eventually I did get through I was told I was now being directed to the correct department. Waited another hour, no response. I have sent emails which have also gone unanswered. This is basically theft and extremely poor customer service. I will taking this further if it is not resolved urgently.