The Isle of Man Bank in Regent Street in Douglas will be open today (Sunday).
It's because of the technical issues with bank systems which means account balances have not been updating properly.
A spokesperson says the problem is strictly of a technical nature and they recognise this is an unacceptable inconvenience for customers.
They say staff in branches and at the telephone centre will answer any questions and help where they can.
The Regent Street branch will be open from 11am to 3pm today and NatWest and RBS International customers can also be served through that branch as well.
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