Vodafone’s pay-montlhy mobile service was the most complained about, according to UK regulator Ofcom, although rival EE also drew its fair share of grumbles.

Covering the July-September 2015 period, Vodafone gathered the most complaints as a proportion of its customer base: 20 complaints per 100,000, a jump from 14 per 100,000 in the previous quarter.

Dissatisfaction about Vodafone was split between three main categories: billing, pricing and charges (37 per cent); complaints handling (28 per cent); and concerns around faults, service and provision (17 per cent).

EE was the only other mobile provider to generate more complaints (9 per 100,000 customers) than the industry average of 8 per 100,000 customers.

Next in the table were Talk Mobile and Virgin Mobile, both with 6 per 100,000. Total volume of complaints for Talk Mobile dropped significantly, compared with 12 per 100,000 in Q2 2015.

O2 and Three UK both generated complaints volumes of 4 per 100,000.  Tesco Mobile generated the lowest volume of complaints per 100,000 customers for the seventh consecutive quarter (one).

Total complaint volume for mobile pay-as-you-go remained at similar levels to Q2 2015, said Ofcom. It did not break out pay-as-you-go figures.

The regulator’s figures also cover fixed telephony, broadband and pay-TV. On fixed broadband, EE finished bottom with the most complaints (45 per 100,000 customers), a position it has held for the whole year.

Problems relating to faults, service and provision (40 per cent); billing, pricing and charges (20 per cent); and complaints handling (19 per cent) were the main drivers for EE’s disappointing performance.