BT claims human error was to blame after a publican from West Sussex received a phone bill for an eye-watering £616,776.
Jack Harding, who runs The Olive Branch pub near Arundel, usually forks out around £100 a month for his BT phone bill.
But he needed a stiff drink after he opened his bill to find he owed more than £600,000, reports The Sun.
A BT spokesman told the paper: "A member of staff filled in the wrong details in the wrong box."
Hr Harding's bill should have been just £92. ®