Adam Scorer at Consumer Focus, said price cuts by four firms in three days was good news.
One of the first causes taken up by Consumer Focus after its establishment was fuel poverty.
Consumer Focus said it was not surprising to see complaint levels rise at a time when prices were going up.
Only Scottish Power showed a fall in complaints, Consumer Focus said.
Consumer Focus said almost 7 million households will remain in fuel poverty.
Consumer Focus found that some staff were not able to offer "large parcel services or more complex transactions" because of a lack of training.
Postwatch became part of Consumer Focus on 1 October 2008.
Consumer Focus calculated that nearly 5.7 million households are in fuel poverty - when more than 10% of their disposable income is spent on fuel.
She has been a member of Consumer Focus since 1 October 2008.
Research by Consumer Focus shows that the number applying for payday loans has increased fourfold in the past five years.