Impossible to change debit order

The service has been great... But changing your debit order bank details... IMPOSSIBLE. For four months now, I have been trying... But then I get a notification that my debit order has not gone though and my services will be cut.. Pay via eft.... Email, contact (well there is no number you can phone, they call y o u) gets promised it will be sorted out next month... And surprise nothing... And now it seems as if my connection got cut as I didn't get the warning and I don't check all my debit orders monthly...