Morrisons has apologised after customers have been unable to get discounts on their shopping ahead of Christmas after a problem with the More loyalty card.
Some customers have also complained that their online orders have been cancelled.
The supermarket says loyalty card and click and collect orders are mostly affected.
“If More Card prices are not registering, we will apply a 10% discount to the customer’s entire shop,” a Morrisons spokesperson said.
They added that some home deliveries may be arriving late today, and that click and collect customers should wait for am email before going to the stores.
Social media users say their discounts are not working at the till, with one person posting a photo of an error message at the self-checkout, which reads: “We are really sorry some promotions and discounts are not working at this time.”
The Morrisons website also appears to be down, with a “502 bad gateway” error message on some pages.
One X user said their Christmas food delivery, which included a turkey, was due to arrive this afternoon. “I’ve just had an email from you saying you couldn’t fulfil my order and it’s been cancelled,” they wrote.
On the Morrisons Facebook page, people have also been commenting that Christmas deliveries they ordered a month ago have been cancelled.
“Half my Christmas shopping isn’t coming including the turkey and puddings and they were ordered a month ago,” one person commented under a post advertising discounts.
Others say they have been missing out on large discounts in store.
The supermarket has been advertising heavy discounts on Christmas dinner food, including vegetables, in the last week.
“I’ve just wasted an hour of my life shopping at Morrisons only to find out by checking my receipt that I’ve been charged £40 more than I should because the More Cards aren’t working. No communication at all, so loads have probably overspent without knowing,” wrote one user on X.