The ATM that I went to (in the middle of a shopping centre) were actually dispensing 3x $50 notes when I was withdrawing $90.
I was so confused and I assumed they might incorrectly put the $50 notes in the $20 shelves. So I went to test it and withdrew another $20. A $50 notes was dispensed instead.
I went to the bank branch nearby (around 10 minutes walk from the ATM) and reported this. To my surprise, they took all the money that I got from that ATM from me 4x $50 notes without adjusting my bank account balance (my balance was already $110 less). They told me that they cannot refund the $110 yet because they need to investigate. Then I told them I still need to withdraw the money and they were willing to process it from my remaining balance. I thought this was a weird solution where the customer become disadvantaged after reporting a malfunction on their ATM machine hahaha.. Anyway I didnt give much thought about it back then and they did refund the balance to me after a period of time.
What would you do in this situation? I wonder if someone maxed out their $1000 daily withdrawal, which means they will get $2500, will the bank allow them to keep them as it will be hard to proof if they actually get $50 notes, in lieu of every $20 deducted from their balance.
Are you using a smartcard? :) Weird indeed a customer reporting get the hassle rather than rewarded.