adventureguy
Innovator
Happened to me once on HDFC using my sisters card withdrawing 10k. Called customer care and they said it'll be reversed in two days. got my money 2 hours after that.^^ Its a pretty common scenario with PSU Bank ATM's which don't have good maintenance. ATM's as you might know are maintained by third party agencies. Private banks ensure good maintenance for their ATM's and problems are rare. Even when such a scenario happens, the transaction is almost always reversed automatically when they see that cash was not dispensed.
Maybe PSU banks don't bother with proper integration and such errors result in amount getting deducted. Sometimes, they are reversed, but if it doesn't happen, you are in for a nightmare. In most cases, they bank will just check their own records, if the transaction is recorded as success in their system. (i.e. amount was deducted), they won't bother that you didn't get the money and will tell you that the transaction is a success.