Unauthorised debits

FNB is reaping us off with these R99/R99.99 unauthorised debits and when you enquire they get you to fill in the debit order dispute form and wait for 40 days. After 40 days they only reversed 4 debits out of a total of 9 and they claim they are still investigating. We as the customers need to excercise our powers and leave this bank. There is plenty banks out there that cares for the people than FNB. I believe a bank is suppossed to look after ones finances and only release debits with proof that they were authorised by the owner but with FNB its the opposite of that.