Woolworths Ltd. on Aug. 8 disclosed that some of its customers using Visa cards were charged twice for transactions between March 11 and 13 due to a processing error by its payments processor Cuscal Ltd.

The charges appeared in the customers' bank statements on Aug. 7.

The supermarket operator said it was not involved in the error and was unaware of it until it was contacted by affected customers.

It also assured customers that Cuscal will rectify the incorrect transactions and provide refunds by 2 p.m. on Aug. 8.