The 224% rise in complaints is "worrying" and customers should shop around to find a better deal, the Government said.
A Department of Energy and Climate Change spokeswoman said:
The rise in the number of complaints is worrying.
We would advise consumers to shop around and switch to find a better deal, whether on cost or customer service.
More top news
The pre-trial hearing for a British banker, accused of murdering two women in Hong Kong last November, was adjourned for five weeks.
Conservationists say one of the UK's most threatened butterflies has recorded its best year for a decade following 2014's warm spring.
The SNP leader Nicola Sturgeon says tonight's TV election debate shows there is a clear demand for a new style of politics across the UK.