Problems with payments into NatWest accounts have continued into a third day, with many customers still unable to access their funds.
The bank said that it had failed to resolve the problem overnight, meaning customers are still yet to have their accounts updated.
Many people were due to be paid in the last few days, with customers of Royal Bank of Scotland and Ulster Bank also affected.
NatWest opened many of its branches early this morning in an attempt to appease customers.
In a statement on its website at 10:30 this morning the bank said: "We are continuing to experience technical issues with our systems, which is impacting a large number of our customers.
"As a result, money credited to accounts overnight may not be appearing on balances today.
"This problem is strictly of a technical nature and we are working hard to fix it as soon as possible. We will ensure that no customers will be permanently out of pocket as a result."
The statement was also posted by RBS, which owns both NatWest and Ulster Bank, although apology was met with criticism from some customers.
"Really not happy," said Liam Davidson. "I hope the company will be providing compensation to your customers, especially those who have missed payments etc because of the company's error."
Another customer said they had tried to contact NatWest but had only received an automated message.
An anonymous customer posted: " Will you be charging interest on overdrafts during this time? I was due to be paid last night but am still in my overdraft thanks to this problem."
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