Following an investigation by regulator Ofgem, business energy supplier BES has been ordered to pay £980,000 for customer service failures.
The review was triggered after Citizens Advice formally referred BES to Ofgem in May 2014.
Gillian Guy, Chief Executive of Citizens Advice, said:
“Energy firms have no excuse for poor service.
“It is unacceptable that BES made it more difficult for consumers to switch supplier and failed to record and handle customer complaints.
“We referred BES to Ofgem after seeing the negative impact this behaviour was having on customers. I am pleased the regulator used our evidence and acted quickly.
“Hopefully this will serve as a warning to the wider energy industry that it needs to clean up its act.”