Accounts don't update details

Updated my banking details, it was confirmed after holding more than 17 minutes. My phone was blocked so made manual payment and called again to ensure payment received and all OK after debit order, long wait, assured all will be fine. Telkom mobile attempts to debit incorrect account twice, so I incur costs and phone still blocked. Did another manual payment. This is horrible... poor really!!! Need amend or CANCEL DEBIT ORDER THEN!!!!!