TAIPEI (Taiwan News) — All Nippon Airways (ANA) on Wednesday (April 26) walked back on its promise to honor flight tickets sold at super low costs due to a technical glitch on its Vietnamese website on April 17.

The website listed the price for a round-trip business class ticket from Jakarta to North America at less than NT$10,000 (US$300), which is normally worth around NT$300,000, and first-class round-trip tickets to the same destinations at NT$30,000. Some are return flight tickets, with destinations in Southeast Asia on the itinerary, including Bali.

At first, ANA told the media that all tickets sold were valid. However, ANA's headquarters said on Wednesday that due to errors in the website's currency conversion system, some customers bought the air tickets at prices much lower than standard prices, CNA reported.

The Vietnamese website had been closed for repair. ANA apologized to passengers for the system error and said all flights booked under the wrong system will be canceled and fully refunded. The affected passengers will be notified by email, per CNA.