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One customer said he missed out on about £20 of discounts.
“I added everything up as I went around the shop and it came to £70, which with all my card discounts and vouchers should have cost me nothing at the checkout,” Steve Weatherby, from Huddersfield, told BBC News.
“But it came up as £90. None of the discounts and offers around the store, like 50p off, had been applied.
“So I had to pay it as I was shopping for Christmas lunch and things we needed.”
He added: “The staff were getting upset as they weren’t aware of what was happening, and it’s not their fault.”
Another customer told the BBC her online order was cancelled on Monday morning.
“I booked it ages ago, when the delivery slots first came out for Christmas,” said Moira Gray, from Northumberland.
Unable to leave the house due to illness, she added she was “really stressed,” as her order included turkey and trifle for Christmas Day.
“[Morrisons] said they couldn’t do anything… they also said their systems were down,” she added, saying that Morrisons offered a £10 goodwill voucher.
Another customer, Lorraine Calvo from Northumberland, had her delivery cancelled in the morning and said Morrisons told her this was due to a problem with the IT system.
“I saw the email at 8.30am and was a bit shocked because they texted me last night confirming the delivery,” she told the BBC.
“It was all my weekly shop to get me through Christmas, and cat food and everything.”
Since this story was published online, Morrisons got in touch with Ms Gray and Ms Calvo, and promised to deliver their orders on Monday, free of charge.
It also disputed the claims that these cancellations were due to the main systems issue, telling the BBC that they were separate problems which were dealt with by customer services.
But it did say in a statement: “If for any reason there are isolated cancellations, our team will be in touch directly to resolve them.”
