TalkTalk failed to inform 4,545 customers their personal information, including bank account details, were stolen as part of the 2015 data breach.
Viewers contacted BBC Watchdog Live about concerns that their details had been breached by TalkTalk.
But the company had told them that their details were not compromised.
“The customer data referred to by BBC Watchdog relates to the historical October 2015 data breach. It is not a new incident ... Read even more
