The problem is that the banks that we use insist that you use the ATM`s maximum before asking for counter withdrawals inside the bank itself.
What is the ATM withdrawal limit? On my last visit quite a few machines declined my card, but would then be OK the next day I tried (same ammount in my account). I was thinking next time I may just withdraw a larger ammount to save any trouble. At one point I was down to my last few pesos, praying the machine would cough up. Luckily it did.