Following scrutiny by Ofgem, Eon (Utility Debt Services) and Scottish Power (Sterling Collections) suspended its use of alternative company names to collect customer debt.
The practice has become less widespread, according to Ofgem, but Npower and Utility Warehouse continue to send letters purporting to be from a different company.
The regulator found that energy firms commonly used alternative branding as a 'last resort' for customers before they are passed off to an external debt collector.
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Firms also used a different company name to chase up final unpaid balances for former customers.
The regulator also said that customers were being "scared" into making unaffordable payments. Letters sent to indebted consumers failed to tell customers that they could agree on a repayment plan if they were struggling to pay.
Instead letters demanded that customers "must pay in full now" and "clear your debt within seven days from the date of this letter."
An Ofgem spokesman said: "Customers must not be misled, pressurised or scared into making payments they cannot afford.
"The aim of this work is to ensure that consumers who are struggling to pay are made aware of repayment options available."
The Telegraph launched its own Energy Shambles Watch campaign in July to pressure the energy industry into improving its appalling customer service levels. We asked our readers to tell us of their bad experiences. If you have a story to tell, email us at money@telegraph.co.uk .
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