TalkTalk has revealed that its broadband base shrunk between April and June 2016.
In a trading statement, the company reported that it lost 9,000 broadband customers during the three-month period.
While various positives could be drawn from the statement, such as revenue growth remaining level year-on-year despite a smaller customer base, the figures suggest the impact of last year's data breach is still being felt.
Nevertheless, TalkTalk is remaining confident and is expecting a modest growth in revenues throughout 2017, fuelled by a "broadly stable" broadband base.
Dido Harding, Chief Executive of TalkTalk, commented: "We are very pleased with how the year has begun.
"We drove growth in mobile and fibre, and delivered real improvements in our customers’ experience."
This comes shortly after insight consultancy Kantar Worldpanel reported that TalkTalk's market share is 8.4 per cent lower than it was last year.
Figures showed that 40 per cent of those who left TalkTalk moved to BT in the months following on from the data breach, which occurred in October 2015.