Yes, it was a Reg E error claim (failure to dispense). The claim has to be made with the card-issuing bank, as your customer did. After going to the source (the bank owning the ATM) you had enough information, IMHO, to reach a conclusion that the ATM withdrawal was completed and the funds dispensed. So you were correct in denying the claim promptly (you don't get to play the investigation out to the full 45 days unless you have to in order to complete the investigation). What you didn't do (unless you forgot to mention it) is provide the cardholder a notice that you denied the claim and indicating that you would honor certain items without charge even if they overdraw her account for five days, etc.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8