Energy provider Bulb has been ordered to pay £1.76 million by the industry watchdog after overcharging customers and blocking switches.
Regulator Ofgem said around 61,000 consumers were affected by the failures between 2017 and 2020.
It found that Bulb overcharged some households as well as blocking consumers from switching gas and electricity suppliers and having issues with the Priority Services Register for vulnerable customers.
Ofgem said Bulb has since made changes to improve its processes and has paid a £1.76 million package of redress, refunds and goodwill payments to affected customers.
Ofgem chief executive Jonathan Brearley said: “Bulb overcharged some customers and risked leaving vulnerable customers without access to essential network services, when it failed to comply with Ofgem’s rules.
“Our rules are designed to protect consumers, and suppliers must make sure they have the processes in place to comply with them if they are going to give their customers good service.
“Bulb has since put things right with affected customers and put processes in place to make sure it can meet Ofgem’s rules.”
