68 minutes, a fibre optic 'upgrade' and cut off!

We decided to 'upgrade' our internet to fibre optics and pay a fortune per month. Our internet is so slow or none existent. When trying to complain we phoned twice, 25 minutes in the morning with no response, 68 minutes in the evening only to be CUT OFF!!! <br> <br> My wife and I run our UK businesses from our home internet and this is disgraceful!<br> <br> Poor customer service, no upgrade, frustrated and too upset to call again. How do we resolve this? Overcharging for broadband fibre optics to get shockingly slow and unworkable internet.