A Tesco Bank customer whose account has been frozen has been left "completely stuck", unable to withdraw money from his account, following a hacking attack on the bank.
Dave Turner said he had attempted to contact the bank to find out why he cannot use his account, but they "seemed confused".
Tesco Bank has said customers will not be able to complete transactions online throughout Monday in an emergency security measure, yet Mr Turner is unable to use his card at cash machines and does not dare to use it in chip and pin devices and be left unable to pay for something.
More than 24 hours after contacting the bank, the father from Portsmouth said he had still not heard back which was "unacceptable" and "pretty poor really", and had only received a generic text message at 4am on Monday morning.
Mr Turner has said he will look into opening an account with another bank after being left relying on money lent to him from family and friends, adding "it's happened this time, so yeh, it could happen again".
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Tesco has said it is "pleased" that its dispute with Unilever has been resolved.
The comments from the supermarket giant come after Unilever confirmed the "supply situation" with Tesco involving the price of Marmite and other products had been "successfully resolved" and that the items are "once again fully available".
In a statement a spokesperson for Tesco said: "We always put our customers first and we're pleased this situation has been resolved to our satisfaction."
Unilever confirmed the "supply situation" with Tesco involving the price of Marmite and other products had been "successfully resolved" and that the items are "once again fully available".
In a statement a spokesperson for the supplier said: "Unilever is pleased to confirm that the supply situation with Tesco in the UK and Ireland has now been successfully resolved.
"We have been working together closely to reach this resolution and ensure our much-loved brands are once again fully available.
"For all those that missed us, thanks for all the love."
It is understood Unilever is in active discussions over price rises with the other major supermarket chains, but Tesco's fellow Big Four grocers declined to comment.
The Co-Operative also said it does not "talk openly around discussions with any supplier".
Discounter Lidl added: "Whilst we do not discuss buying prices, we can always assure our customers that we will offer them the best quality products at the lowest retail prices."
Consumers have been told they could face a New Year surge in prices as experts warned the Tesco spat was just the "thin end of the wedge".
Steven Dresser, retail analyst at Grocery Insight, said there was likely to be a round of price hikes in January as retailers look to pass on higher costs once the festive season is out the way.
Retailers are facing rising costs of goods and materials from the plunging value of the pound since the Brexit vote, but are under pressure to keep prices low amid an intensely competitive market.