British Gas has apologised after overcharging a pensioner on her energy bills for seven years due to their inaccurate calculations.

Ada Daly, 73, needed to borrow money and tackle part-time jobs to pay her invoice every month from her power provider.

As power costs soared, Ms Daly had been paying £500 a month; nevertheless, after assist from her husband’s good friend, she proved that she was being overcharged over double what her precise invoice was.

They found that her previous imperial fuel meter had been modified to a metric one however British Gas carried on­ ­calculating the invoice utilizing imperial measurements.

It meant Ada was paying almost 2.5 occasions as a lot for fuel at her small flat in Oban, since shifting in seven years in the past.

Despite ignoring repeated complaints that the gasoline calls for for her flat had been unsuitable, British Gas have now admitted issuing the inaccurate payments.

British Gas confessed it was “extremely sorry” and paid her again £3500 plus a ­paltry £250 goodwill fee.

Ms Daly mentioned: “It is a nightmare when nobody listens to you for seven years. Because of British Gas, I’ve had to tighten my belt more and more in order to pay exorbitant fees, until I could hardly breathe from the stress and frustration.

“Thanks to British Gas, my ­outgoings have far exceeded my incomings. I’ve had to stop going on my annual holidays to South Africa to visit my family, I’ve had to give up my TV package.

“I’ve had to borrow money every month from my son in order to help pay my bills, I’ve had to give up socialising with friends, cinema trips, eating out.

“I’ve had to cancel a much-needed dental appointment because I couldn’t afford it, I’ve had to take on two part-time jobs in order to bring in some revenue for British Gas.”

A British Gas spokesman mentioned: "We are extremely sorry for not resolving Ms Daly’s complaint sooner."

An Ofgem spokesman mentioned: “When things go wrong, suppliers must put things right quickly.

“Our customer service expectations are clearly defined in our Quality of Service Guaranteed Standards.”