Failure to change debit order details

I have updated my debit order at least 3 times since November last year at 2 different branches (Cavendish as well as Kenilworth) and via the call centre. I was assured each time that my details were successfully updated. However, my account has now, for the second time, been suspended due to non-payment.<br> <br> I cannot continually bear the brunt of Telkom's poor service and I trust this matter will be attended to.