Fnb poor service

For the past 2 months i had 2 ******* or unauthorized debits against my account. I called fnb *****, who fowarded me to debit order disputes, who reversed tbe entry and i was billed R40 for dispute. I called in again in August as the the same occurred, ***** forwarded me to debit order disputes(10 min hold time) who cut me off while i was talking. I am very disappointed with fnb service. Why was billed for a debit order dispute i didnt authorized.