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Based on 528 calls to 22 energy suppliers In September and October 2015. Which? called each energy firms’ customer service number 12 times each at set times of the day, and recorded the time it took to speak to a human being. The same was done for their sales number. They then calculated the average time as the median of the 12 calls.

Based on 528 calls to 22 energy suppliers In September and October 2015. Which? called each energy firms’ customer service number 12 times each at set times of the day, and recorded the time it took to speak to a human being. The same was done for their sales number. They then calculated the average time as the median of the 12 calls.