Vodacom WiFi/fibre

I took out a Vodacom fibre contract but we were given the WiFi for interim basis while we were waiting for the fibre construction to be completed,worst mistake of my life,the router never worked not even once,I kept reporting the matter to the consultant who helped and even escalated the matter to Vodacom myself but nothing was done,I kept on saying I don't want the contract anymore as none of the services were ever delivered,the router never had any network,I don't remember even once we're it had network,I kept receiving statements even after I made it clear that I don't want this product...now am unable to take metro fibre because Vodacom claims that I owe them 8000 for something that never used, Vodacom is the worst service provider,I don't know why they still offer fibre service, horrible,horrid, pathetic service ever