Bad service from Vodacom

We took out a contract with Vodacom and was sent a router and was told we would be sent a ****le with 100gig free while we wait for our fibre to be installed. We received our router with no ****le and that was after we already gave our previous service provider notice, we then cancelled our contract with vodacom on the 6th June 2021 as we were not provided with any service. They now want us to give them a months notice for something I haven't received, they are now holding us ransom and won't release our ISP line so that our new service provider can proceed with our order. The bad service we received from Vodacom is becoming the norm now, we phone several times only to be cut off and passed around from pillar to post.