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
British Cycling's Dr Freeman has told MPs that the controversial jiffy bag delivered to him in France contained only a common decongestant
Local roads in England and Wales are so potholed that they resemble "Swiss cheese" and one in six will not be fit for purpose in five years.
The singer best known as Johnny Rotten offered advice for Britain's Brexit negotiators as he told ITV News his biggest hit is misunderstood.