“It’s the kind of bill that could give you a heart attack” - these are the words of a grandfather who faced a £8,275 bill for less than six months of electricity use.

East Anglian Daily Times: Rob Gray has received a huge electricity bill from Scottish Power.Rob Gray has received a huge electricity bill from Scottish Power.

Rob Gray, a retired taxi driver, received the bill from Scottish Power on December 5, and since then he has been unable to get any meaningful response from the energy company.

Mr Gray, from Westley, near Bury St Edmunds, said: “I tried to ring them, but couldn’t get through. I tried booking a call back but none were available.

“Eventually I emailed them and they sent me the response saying they would phone within 10 days. They never did.”

On December 29 he received an email demanding payment. “I have tried everything to get in touch with them,” the grandfather said.

“That email was the point at which I thought ‘that’s enough’.

“You would think someone at some point would have looked at the bill and noticed something was not right.

“I have had a few sleepless nights over this.

“It’s not that I think I will have to pay it, but it is frustrating.

“I am on heart pills, but I am relatively healthy, but it’s the kind of bill that could give you a heart attack.

“I would normally expect to pay £250 to £300 over the winter period, but this is mad. I don’t even think a small business could use this much.”

Mr Gray received an apology from Scottish Power, but not the one he wanted.

In a letter they apologised for IT problems and said his “delayed” bill would be sent in due course.

“My bill was not delayed, it was just completely wrong. They have not recognised that at all,” he said.

An error in the estimated night time reading put the total usage for the period at 99,057kwh, compared to the equivalent last year of just 3,331kwh.

A spokesman for Scottish Power confirmed they would be investigating the case, but due to a public holiday in Scotland on Friday, was unable to offer any further response.