Unexplained Honouring Charges

Just went through my statement now and noticed that standard Bank charged me R132 in honouring fees. Reading online, an honouring fee is charged in the case of an honoured debit order if the client has insufficient funds to cover the amount of the debit order. This is very confusing because I do not have debit orders due today (1). (2) My balance was more than 9k at the time of the charge and has been for the last 2 days so whatever debit order would have been fulfilled. I would like my funds returned to my account, please. And also, I know this is not first time this happens, just happened to catch it this time round.