कॉल करने वाले ने कहा वह बैंक के 'साइबर सेल' से है और लेनदेन वापस कराएगा

This is the second-stage fraud that targets people who have already been defrauded. Knowing your amount and date means your complaint details leaked or he simply guessed from a list. No bank cyber cell calls you, and no reversal requires an app on your phone. Do not install anything.

I got the same call. He became aggressive when I said I would call the branch to confirm. That reaction is the tell.