“We are very sorry for any disruption and will ensure that no impacted customer is left out of pocket,” a Barclays spokesperson said on Sunday.
“We are keeping our call centres open for longer this weekend and we will be proactively contacting customers who may be vulnerable.”
Barclays is one of the UK’s largest banks, with more than 20 million UK retail customers.
On Saturday, the website downdetector, which monitors outages, showed nearly 5,000 issues had been reported with Barclays, more than double the number reported on Friday.
On Saturday afternoon, Barclays’ website said problems with its app and online banking were ongoing, and warned customers that they may face issues making and receiving payments.
The website also told customers that their high street branches may not be able to assist with all queries “due to issues we’re facing”.
The Bank confirmed on Sunday that customers could now use its services as normal.
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