People who called the Commonwealth Games ticket line were charged while listening to the engaged tone, it has emerged.

Organisers apologised for the problem, which has been blamed on a "human programming error".

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Glasgow 2014 said it is working to refund the charges to affected customers "as soon as possible".

The latest glitch comes after the ticket sales website was hit by problems, with customers facing delays of more than 30 hours when extra tickets went on sale on Monday.

The website and phone line have been closed while the issues are investigated and could remain shut for days.

It has been reported that some customers ran up bills of more than £100 while trying to buy tickets through the hotline.

A Glasgow 2014 spokesman said: "Glasgow 2014 can confirm that some callers to the Glasgow 2014 ticket line who received an engaged tone on the ticketing phone lines were charged in error by TalkTalk Business, a supplier of Ticketmaster.

"We apologise unreservedly for this and are working now with Ticketmaster and TalkTalk Business to ensure customers affected by this are refunded these charges as soon as possible."

An extra 100,000 tickets across all 17 sports and the opening and closing ceremonies went on sale on Monday.

A TalkTalk Business spokesperson said: "We are sorry that due to a human programming error, we did not deliver the service that had been agreed with Ticketmaster during the general ticket sale for the Commonwealth Games. This meant that those customers who called the Commonwealth Games ticket line and received the engaged tone were charged for the call in error.

"We apologise unreservedly to all affected customers, Glasgow 2014 and Ticketmaster for this. We will refund each and every customer that has been incorrectly charged."

Customers who think they may be eligible for a refund should email a scan or photograph of their bill, showing the dialled number and call charges to

Around 55,000 tickets have so far been sold from the latest ticket release, organisers said.

About 2.3 million applications were made for the initial one million tickets released last year, with athletics, aquatics and cycling proving the most popular events.

BT said it had contacted some customers about their calls to the hotline.

A BT spokeswoman said: "We contact customers if we see unusual or excessive usage on their lines to alert them to the change in their calling pattern.

"In this case, although the caller didn't speak to anyone, the calls were connected to the receiving number and the relevant charges were correctly raised.

"In the last 24 hours, we've warned a very small number of customers about their calls to Ticketmaster. BT is not part of the Glasgow 2014 ticketing operation."

Speaking on a visit to Glasgow, Prime Minister David Cameron said: "There are always some problems when you've got such a complicated set of things to get right, right across the piece. There are always some things that need some last minute attention.

"I'm sure that this will be sorted out, I am sure that the Scottish Government will get on top of it straight away, and what I see is the preparations going well for a successful games."