Some customers are forced to pay for a broadband speed that is faster than the one they are getting, according to a consumer group. Which? accused broadband companies of forcing some customers to pay for speeds they may never get.
Which? found 63% of the 2,012 broadband users quizzed experienced problems with their internet and 45% suffer through slow download speeds.
They are calling on providers to give their customers "the speed and service they pay for".
Which? executive director Richard Lloyd said: "The internet is an essential part of modern life, yet millions of us are getting frustratingly slow speeds and having to wait days to get reconnected when things go wrong.
"It's less superfast broadband, more super slow service from companies who are expecting people to pay for speeds they may never get."