The meter in David's home in Surrey failed to automatically send regular readings since it was first installed.
Lydia Joseph fears her grandfather living alone since he was widowed in 2016- is owed as much as £7,000.
Supplier EDF maintained "all historic overpayments" had been addressed, after David was refunded £700.
Retired horticulturist David - whose surname is not being published to protect him from scammers - first noticed something was amiss when his monthly direct debit was "suddenly hiked up massively" from £70 to £260.
This story is from the {{IssueName}} edition of {{MagazineName}}.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 9,000+ magazines and newspapers.
Already a subscriber ? Sign In
This story is from the {{IssueName}} edition of {{MagazineName}}.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 9,000+ magazines and newspapers.
Already a subscriber? Sign In
RUUD DESPAIR AT United EXIT
RUUD VAN NISTELROOY has been left devastated by his Manchester United departure.
Shock rise in dental patients going to A&E
SOARING numbers of people who have trouble with their teeth are turning up at A&E departments amid rising concern about lack of access to NHS dentists.
3D modelling revolution for facial surgery
THOUSANDS of people needing facial reconstructions after being injured in car crashes or falls are set to benefit from pioneering 3D modelling.
Acid attack paedophile jailed for 30 years in U.S.
A VIOLENT criminal who put two police officers in hospital after dousing them with acid has been jailed for 30 years for a sex attack on a nine-year-old boy in the US.
Bruce wife: Daddy's not going to get any better
Christmas heartache of star's family
Richard on target for new Citadel filming
ACTOR Richard Madden has been spotted filming the second series of high-octane spy drama Citadel, writes Jaymi McCann.
Kemi: Hate crime laws are wasting police time
HATE-CRIME laws must be reviewed to stop people \"wasting police time on trivial incidents\", says Conservative leader Kemi Badenoch.
Trump ready to get tough on Iran...again
DONALD Trump's Cabinet choices have led Iran opposition groups and experts to believe regime change is now inevitable for the Islamic nation.
"There was a high degree of trust without the checks'
A PROMINENT MP who attended at least one Christian camp at which John Smyth groomed his abuse victims says confidence in the Church of England has \"collapsed at every level\".
Fans unleash Tyson fury as boxing legend turns into 'human punch bag'
BOXING great \"Iron\" Mike Tyson was booed out of the ring after being easily beaten in his comeback showdown with YouTube fighter Jake Paul, writes Mike Parker.
