Energy suppliers have been named the worst firms for inaccurate bills in a new survey conducted by uSwitch.com.

According to the firm’s research, 8.2 million energy customers have received incorrect bills during the last two years, prompting many to rank them above water and communication companies as the worst for inaccuracy.

The company also found that on average it takes over two months for an incorrect bill to be rectified, with 15 per cent of respondents said that it took more than six months to resolve their billing problems.

Ann Robinson, director of consumer policy at uSwitch.com, said: “Despite well publicised changes to billing systems and promises to put their house in order, suppliers continue to let their customers down – no other industry operates such a hit and miss approach to accuracy.”

A recent study conducted by moneysupermarket.com revealed that using separate energy suppliers can potentially save more money than choosing a dual fuel tariff.

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