Extra charges

I have always wondered what the extra charges on my account are, to date, I have never received a reasonable explanation to even justify the charges, ok you sign up for an account and you get charged a monthly fee, in my instance it’s R230 and inclusive in that amount are certain transactions e.g withdrawals etc….but come month end you get these ridiculous unexplained charges, “transaction fees” I mean I get it when you go over your allocated transactions e.g if you get 4 free withdrawals you will be charged extra for any additional transactions above that….in my instance a lot of my transactions are electronic, debit orders and swipes, to date I don’t get why I get charged so much extra, I have been with ABSA for almost a year now and every month I get charged almost double….why??