Pathetic connection

99% of the time the internet is extremely slow or no one in the house has no wifi connection whatsoever. The contract is on my father's name as he pays for it, but we all have to use it at home. My kids do school online, so they need internet. I am beyond irritated. What's the use of having to switch to my cellphone data when we pay for Fibre that's supposed to be a fast speed and excellent. I almost never have wifi.