UNAUTH DR BAL FEE -R100

My absa current account has an unauthorised fee of R100 that went of on the 2nd November 2017. I phoned the call centre and visited the branch and both consultations were in vain They both assumed that I have an overdraft attached to it which is not the case. and i have have made it clear that i do not have overdraft, if not mistaken i think this is the third complain this year.