Did not install fibre but charged me cannot cancel because i did not receive router

App**** for fibre line .Feedback was they need proof of address as they are not able to locate the premises. Then 3 months later they locate the premises and proceed to debit my account which i am then liable for. i managed to find another service provider which did give me the service that i needed. They wont refund me the installation costs but did not install the line ie charging me for not installing a line? Cannot cancel even before product is supp****