Dixons Carphone has had to reissue its Christmas sales figures to say that sales declined, did not increase during the period.
The retailer, owner of Currys PC World, had previously reported an increase in sales, but then said he had made an “administrative error.”
He issued a new statement for the last 10 weeks of the year, saying that sales had fallen 2% instead of having increased 2% as the company had previously reported.
Commercial statements are not verified by accountants.
However, errors in official announcements are rare.
An increase in sales of large 65-inch televisions could not overcome a sharp decline in the difficult mobile phone business of Dixons Carphone, where revenues fell 9%.
The drop in his telephone arm is in line with expectations, and Dixons Carphone has said he hopes this will be a difficult year for the mobile phone business.
Mobile sales have been under pressure because people are moving away from high-value monthly contracts and are updating their phones less frequently.
The fall in sales follows a familiar trend.
Recent data from the British Retail Consortium revealed that retail sales fell for the first time in a quarter of a century last year.
And John Lewis recently warned that his staff bonus may be in doubt after reporting that Christmas sales at his department stores fell 2%.
Dixons CEO Alex Baldock praised his experiences in Gaming Battlegrounds computer games, which he said were helping to gather more customers.
However, he told City analysts that he “did not have” an improvement in the UK shopping market.