TalkTalk has again been named the most complained-about broadband company in the UK, in the latest report from the telecoms regulator Ofcom.For every 100,000 TalkTalk customers, about 31 made a complaint to Ofcom about the company's broadband services between October and December 2017.Technical faults were the main reason for complaints, according to the report.BT and Vodafone were the most complained-about mobile operators.Vodafone was also the most complained-about mobile operator in the previous Ofcom report, published in January.BT came out worst for pay-TV services.When TalkTalk topped the broadband complaints list in January, it said it had closed customer service centres in India and was delivering a "material improvement in customer satisfaction".However, the latest Ofcom report shows that the number of complaints about TalkTalk's broadband has increased.The company also attracted the most complaints for its landline telephone service."We always strive to provide the best possible experience, and are disappointed by these results," the company said in a statement.It again indicated that the "closure of our contact centre in India" was to blame for the poor figures, as it had "caused some temporary disruption for customers".Broadband complaints taken to OfcomMost complaintsTalkTalk - 31 per 100,000 customersBT - 27 per 100,000 customersPlusnet - 27 per 100,000 customersFewest complaintsVirgin Media - 14 per 100,000 customersEE - 12 per 100,000 customersSky - 7 per 100,000 customersOctober-December 2017, source: OfcomMobile complaints taken to OfcomMost complaintsBT - 11 per 100,000 customersVodafone - 11 per 100,000 customersVirgin Mobile - 10 per 100,000 customersTalk Talk - seven per 100,000 customersFewest complaintsEE - three per 100,000 customersThree - three per 100,000 customersO2 - three per 100,000 customersTesco Mobile - 1 per 100,000 customersOctober-December 2017, source: Ofcom