PepsiCo has been warned about its advertising promotions after a repeat winner of an hourly £500 prize was told only one would be honoured.

The promotion on Pepsi packaging invited customers to text the last four digits of a barcode for the chance to win the money every hour. But one person complained only one prize of several he had won would be honoured.

PepsiCo said the significant terms and conditions of the promotion were on the product label and the associated web page, which customers had to agree to by ticking a box, and included a limit of one entry per mobile phone number or email address.

However, the Advertising Standards Authority said PepsiCo had not proved the complainant's entries were made by means other than generating multiple email addresses.