"The vast majority" of customers are "happy" with their energy providers service, despite a surge in the number of complaints against the "Big Six" companies, an industry trade group said.
A spokesman for Energy UK defended companies like npower and E.ON and claimed they "take their relationship with customers extremely seriously".
The vast majority of energy customers are happy with the service they get with only around one in every 1,400 customers likely to need to contact their supplier about a problem.
Most complaints only need a phone call to sort out - around four out of five queries are resolved by the end of the next working day - but, if the problem cannot be resolved, the energy ombudsman is there to ensure problems get fixed.
Energy companies take their relationship with customers extremely seriously and work hard to improve customer service.
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