TalkTalk generated the second highest volume of complaints, with 0.12 per 1,000, an increase since the fourth quarter of last year.
Cable operator Virgin Media generated an average number of complaints for the industry, with 0.04 per 1,000, while Sky imporved its performance to as few as 0.01 complaints per 1,000 customers.
In broadband, EE generated the highest number of complaints – 0.51 per 1,000 – an increase in the number of complaints quarter-on-quarter and the highest level since the first quarter of 2013.
BT, Plusnet and TalkTalk generated above average levels of complaits for the period, while Virgin Media generated a small but growing number of complaints at 0.06 per 1,000. Sky delivered the best performance, with 0.05 complaints per 1,000 customers.