Orange has replaced TalkTalk as the UK's most complained-about fixed broadband provider.
The firm - a subsidiary of EE in the UK - received 0.50 complaints per 1,000 customers during the third quarter of 2012.
This was up from 0.29 per 1,000 customers in the second quarter of the year, according to figures published by the media regulator Ofcom.
TalkTalk received 0.35 complaints per 1,000 customers, down from 0.42 in the April to June 2012 quarter.
Ofcom said the data revealed "a significant spike" in complaints about Orange's home broadband services in September.
"This appears to be related to Orange’s customer notification of the withdrawal of its free broadband offer unless customers acquired line rental from the company," the regulator stated.
The number of complaints received by TalkTalk remained higher than the industry average of 0.24 per 1,000.
However, Q3 2012 is the first quarter since Ofcom began publishing data that TalkTalk did not have the highest volume of broadband complaints.
As recently as the first quarter of last year, the firm received 0.81 complaints per 1,000 customers; more than twice the industry average at the time.
BT also generated above average complaints levels during Q3 2012, rising slightly from 0.31 to 0.34 per 1,000 subscribers.
Virgin Media saw its score drop from 0.15 per 1,000 customers to 0.12, marking a slight improvement for the firm.
But Sky’s broadband service attracted fewest complaints – 0.09 per 1,000 customers, down one hundredth of a percentage point from 0.10 in Q2 2012.