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
Long-awaited A-level results will be received by teenagers on Thursday, the first to do so following major reforms of the system in England.
Theresa May will today announce details of a new mental health awareness course designed to help struggling teenagers.
A-level results will be on Thursday, but what should you do if your results are not quite what you had hoped for?