Unexplainable Honouring Fee

I woke up to a debit of R132 on my account with a reference of “Honouring Fee” on 13 August 2019. On enquiry from your consultants I was told that clients are charged this amount should a shop do their banking days later. My question is that why am I being charged this amount when on the day of a transaction my available balance was reduced immediately to reflect a successful purchase. I don’t understand the explanation given by the consultant and would like to request that this ******** debit be reversed.