Scottish Power, Ovo Energy and British Gas must “urgently” improve their customer service after a survey found they are the worst energy suppliers for responding quickly and effectively to problems, Which? said.

The watchdog said “all too often” consumers were being left on hold, stuck in never-ending chatbot loops or passed from department to department with no resolution or helpful answer to their query.

Energy is currently the worst performing sector for customer service, according to Which?’s 2023 customer service survey. That is particularly unacceptable when soaring bills have driven the cost-of-living crisis and led to “huge” profits for many suppliers, the consumer group said.

Scottish Power, Ovo Energy and British Gas were the worst performing energy firms for quick responses and effective solutions to customer problems, the survey found.

Scottish Power came bottom, receiving a satisfaction score of minus 13 out of a possible 100 for how long it took to get in touch with a person who could help, and a score of three for how long it took to get an answer to an issue or query.

One customer said that after being left on hold when trying to phone his supplier about a billing issue, and then speaking to an agent who was unable to help, he suffered sleepless nights and anxiety over the unresolved problem.

Another said he lived in fear of a visit from bailiffs after Scottish Power passed him from agent to agent and failed to fix an incorrect bill.

Ovo Energy followed closely with a satisfaction score of minus seven for how long it took to get in touch with a person who could help and seven for how long it took to get an answer to an issue or query.

British Gas fared slightly better with a satisfaction score of 16 for the length of time it took to get in touch with a person who could help and 23 for getting an answer to an issue or query.

However, its scores were still far below Octopus Energy, who performed best for quick and effective customer service, achieving a score of 46 for how long it took to get in touch with a person who could help and 55 for how long it took to get an answer to an issue or query.

E.On Next also performed relatively well, scoring 35 in the first category and 25 in the second one.

A ScottishPower spokeswoman said a “more robust” study by Citizens Advice found 98% of customer emails were responded to within two days, and the firm’s average speed of answering phone enquiries was under 110 seconds.

She said: “We’ve worked tirelessly to improve and enhance our services for all of our customers and will continue to do everything we can to help them.”

British Gas said: “We’re investing over £50 million in customer service. This includes hiring 700 more UK-based contact centre staff at the end of last year and introducing longer call centre opening times.

“We’re also helping our most vulnerable customers through our sector leading £140m customer support package.

“It’s important that data used by Which? reflects the here and now and isn’t behind the curve.”

Scottish Power, Ovo and British Gas ‘must urgently improve customer service’