A bug with Citi's iPad app has seen some customers who have paid bills using their tablets charged twice, according to the New York Times.
The issue first surfaced in July but was not spotted until December and has affected around two per cent of tranasctions carried out through the app, a spokesman told the Times.
Citi insists that the bug has not affected other mobile applications but some customers claim that they have been charged twice despite not using the iPad tool.
The bug was fixed as soon as it was discovered and affected customers reimbursed and refunded for any charges they incurred as a result of the mistakes.
Users of Citibank Bill-Pay App Charged Twice - NY Times