We got into a fibre contract with Vodacom since last year December it has not been installed till this date

We got into a fibre contract with Vodacom since last year December it has not been installed till this date . When we try cancelling the contract they take us from pillar to post, while we are being billed for something that is not even working. The installation guys do come through only to mess things up and we never have a solution. I’m really not happy with the service we received I even lost my online job because I had no internet connection.