CONFIRMATION E-MAIL OR LETTER

I called fnb call center to cancel a scheduled debit order on my cheque account - then requested if they Could please confirm this being done via e-mail and all 3 consultants after transferring me back and forth for this said the cancellation or deleting has been done but confirmation it cant be done. This is my account and I pay all the charges for it and a simple request cant be done and to top it off there are no supervisors when you wants to escalate.