The findings also revealed that factors including inaccurate billing, infrequent meter readings and slow complaint responses were a major cause of dissatisfaction for businesses.
Discussing the customer satisfaction survey, Mr Scorer said: "Ten years after the energy market was opened to competition, suppliers are taking small businesses for a ride, trading on their lack of knowledge and information to write restrictive, punitive contracts and provide shoddy customer service.
"As energy consumers, small businesses are disregarded, yet they make up 95 per cent of the UK economy.
energywatch was established in 2000 to protect and advise energy customers who have problems with the UK's energy companies.
The body works with Ofgem to ensure the performance of gas and electricity suppliers is sufficiently monitored.
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