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MoneySavingExpert.com investigation uncovers “huge number” of problems with billing, incorrect tariffs and customer service issues
Operator saw complaints rise from 0.14 to 0.20 complaints per thousand customers as mobile complaints rose for first time in a year while EE tops fixed line and broadband lists
Investigation into complaint monitoring and enforcement found Three did not handle some complaints in fair and timely manner
Data for April, May and June also shows O2 received the fewest customer complaints out of mobile contract providers
CEO Paul Clark thinks telecoms companies need to get support from their executives to fight ownership of the problem of customer dissatisfaction