ABSA is totally frustrating, quite disgusted!!

On the 31st of January, I received a notification on my Absa app notifying me that "Due to a technical error fees for some digital transactions that you performed between November and December were not billed from your account. The charges will be debited with your January 2019 fees. We apologize for the inconvenience." Firstly that is not my duty to keep track of what fees were not billed for any transaction whatsoever, it should be ABSA's responsibility to maintain and keep track of any technical errors at the soonest convenience as I as a customer am unable to fix their "Technical Errors". Secondly ABSA can not even notify what amount exactly the fees are, one minute you have x amount in your account as per your last sms notification from the previous transaction, then the next minute you try and purchase something a few hours later and it declines due to insufficient funds. Thirdly when i make a purchase using my swipe facility, whether the merchant banks their money or not it is not my problem, once again when you look at your account as per last notification you see a certain amount then the next, money is deducted when trying to make the next purchase and then you call ABSA to enquire and the only thing they can say is "It is probably due to the merchant not having banked their receipt, yet when the previous transaction was made I got a notification that the amount for the purchase has been deducted from my account. I am truly failing to understand how ABSA operates as a major financial institute, this is extremely frustrating and totally disgusting to have to be experiencing stuff like this as a customer. I think i have had my fair share of this bull**** and will be without hesitation changing banks if this matter can not be justified and dealt with accordingly.