UNAUTH DR BAL FEE SEE CHARGE STATEMENT DETAIL - R100.00

For some reason I have this charge on my statement this month. The only difference between this month and month's prior was that I had to call ABSA from one of the branches where the employees couldn't help me with an inquiry and told me to call using the phone they have at the branch. At no stage was I informed of a R100 charge that would happen. Now this is me speculating as to what could possibly be the reason for this additional charge on my account as there is literally no other reason for it, I have not signed up for any additional services. Please can I get an answer for this. Thank you.