Paying for a service I don't use

I was signed up for Fibre at the Junction apartments by Vodacom agents and that were always nagging me. I eventually agreed and was using for over a year with no issues. However my lease ended this year June and I moved out. Haven't been using Vodacom's Fibre from then, I tried to cancel as I was told it's not a contact but until today this thing is not cancelled and now I am getting a statement that I am owing over R1000 and for what? These guys are messing up my credit score and I've sent emails, Facebook messages and nobody is bothered. I am not using your services, that router is in a box somewhere unplugged but I have to pay for Fibre. I need you off my ITC!!!!