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https://www.which.co.uk/news/2019/08/best-and-worst-brands-for-customer-service-in-2019/
We did a market appraisal before choosing a supplier for our building. I've never been a customer but the Which? report is pretty damning and when we approached people directly who are current customers 7/10 rated their customer service experience as 1/5.
I have no personal experience with their consumer product though. They're actually pretty shit hot for corporate fiber.
Really? Mine hardly ever seems to have issues and when I've called their support (normally to hassle them for cheaper bills) I've got some nice people.