Why are you charging me for your system delays???!

I have just checked my account statement and was shocked to find that Nedbank had charged me R270 (R90 x 3), for honouring payments made on Saturday 31st October, I apparently made these payments when my account had been overdrawn. This was particularly shocking to me because on the day that I made those payments, I checked my balance using the Nedbank App Suite and it showed I had a positive balance of more than R800. Furthermore, I only received the low balance notification on Tuesday 3rd November, after which I moved money from my savings account, into my current amount to make sure that all due payments were provided for. So you can imagine my shock when I checked my balance today and found that R270 had been taken due to my account being overdrawn when I was cautious enough to check my balance before making any payments and this was not the case. The low balance notification is also meant to provide us with 36 hours \to make a plan""; and when I received the low balance notification; I made provision;within 24 hours? Mind you my transaction sms' are always a day LATE!"""