Morrisons has admitted some customers are experiencing issues when paying online - with shoppers complaining that their deliveries are being cancelled "without warning".
In some cases, customers say their payment details are still up to date and valid - leaving them baffled as to why they can't get their shop.
Others said their orders were scrapped by the supermarket just hours before they were due to be delivered, while some say they can't put through new orders either.
Morrisons confirmed to The Mirror that some shoppers are experiencing problems and has now updated it website.
In a document help sheet published online, the supermarket said some accounts are being blocked if they have an outstanding unpaid order.
"Your account will be blocked until you pay for this order," the document on the Morrisons website states. It goes on to instruct users to update their payment details again.
Are you a Morrisons shopper who is still experiencing payment issues when trying to order online? Let us know: mirror.money.saving@mirror.co.uk
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The online instructions also suggest some shoppers have had trouble paying for a delivery pass. It still isn't clear why some payments are failing in the first place and whether this is down to system error.
Morrisons claimed "a small number of customers" are being affected by the payment issues. The Morrisons Twitter page has been hit by dozens of complaints from unimpressed shoppers.
One customer said: “What is going on with your online orders? You have cancelled our order twice even though our payment card is up to date and valid.
“I tried your call centre but they just cut me off after I waited 40 minutes. Will our order go through or shall we go elsewhere?”
Another asked: “Why has my order been cancelled late night before the morning of delivery? There is nothing wrong with my payment details. You have taken payments from the same details the last several orders…
“And why is there no checks and warnings before this!”
A third said: “Won’t take payment and now won’t let me order again. Customer services can only apologies that it won’t work and admits a fault with your system.
“Not good enough. I want a refund on my delivery pass and will go back to Tesco.”
A fourth commented: “I've had an email saying that my payment for the order delivered Monday failed.
“I've tried to follow the instructions on the email to pay for the order but it is not letting me do so.”
The last big update to the way Morrisons takes online orders was in June this year when the supermarket started charging a 5% holding "deposit" on all online orders.
The supermarket says this is to cover the cost of substitutions if an item you’ve ordered is out of stock and needs to be switched out with something else.
If no substitutions are needed, or if there is money leftover from any swaps, the deposit will then be issued back to you when your final bill clears within two days of delivery.
Morrisons spokesperson: "We've not made any changes to our payment terms but we have seen a small number of customers experiencing issues making payments.
"We're working hard with our payment providers to resolve the issue."