An additional thought -- It has been a long while since I was involved in inter-bank ATM error claims and adjustments. But when I was, the network operating rules had strict timing requirements for an ATM owner to respond to a claim like the one you placed, and if the ATM owner missed a deadline, and the card-issuing bank sustained a loss because it had to pay its customer, the card-issuer could file a rules violation claim that would force the ATM issuer to pay up.
I imagine that today's ATM networks are just too big and too busy for such minute details, but I thought I'd throw it out there just in case your network has anything similar.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8