Some Yorkshire Bank and Clydesdale Bank customers are still experiencing problems with using their debit cards after an IT glitch earlier this week.

The problems were first reported last Sunday morning when the system operations of the two banks – which are part of the National Australia Bank – were being transferred to external contractor First Data, a merchant processing service provider. The problem reoccurred on Tuesday 6 March.

However, a reader has been in touch with Computerworld UK to say that she was experiencing problems up until yesterday (Thursday 8 March).

Margaret Munnery had tried to buy car insurance over the phone using her debit card yesterday, but was told that the issues meant that the payment would not go through.

"I wasn't happy on Wednesday (7 March) with the Yorkshire Bank as they had assured me on Tuesday that the problem would be resolved by midnight that day. On Wednesday, all they could do was make a verbal apology over the phone," she said.

Yorkshire Bank advised Munnery to use another card to sort out her insurance, but this option was not available to her.

"I now know that the problems started last weekend. I feel that Yorkshire Bank should have alerted account holders to the fact. There were no notices in the bank or online," she said.

Yorkshire Bank has apologised for the ongoing problems and said that it continues to deal with customers "sympathetically".

A spokesperson for Yorkshire Bank said: "While our debit card service continues to operate normally, we are working to resolve any remaining problems caused by the service disruption on Sunday and for an hour at lunchtime on Tuesday.

"Customers will not be financially disadvantaged and we will investigate related claims on a case-by-case basis."

The direct debit problem is not the first IT problem that the banks have experienced in recent years. In 2010, a software update error caused thousands of Clydesdale Bank and Yorkshire Bank customers to make incorrect payments on their variable-rate mortgages.