Are you referring to debiting a subscriber’s personal account? Why did this problem occur before your intervention?

Yes, it concerns debiting from the subscriber's account.

The problem arose due to incorrect transaction processing logic in the software, which led to double debiting or debiting at the wrong time. There could also have been data synchronization errors between modules, causing the account status not to update correctly.

Before my intervention, there was insufficient control and validation of debit operations, as well as the absence of rollback mechanisms in case of errors, which led to these issues.