The UK's biggest energy supplier, British Gas, mis-sold energy deals by making exaggerated claims to potential customers, the regulator has said.
Ofgem said British Gas sales staff did not make accurate comparisons between suppliers' deals, and so made overblown claims about savings for switching.
The cases involved British Gas staff working in Sainsbury's stores nationwide between 2011 and 2013.
An average of £130 compensation has been paid to 4,300 affected customers.
The company has been unable to contact another 1,300 affected customers, so their compensation will also go into a fund to help vulnerable customers.
http://www.bbc.co.uk/news/business-28159968