COMPLAINT AGAINST VODACOM

I took out a telephonic contract with Vodacom. The handset was delivered. I was unhappy. Before the number could be activated I cancelled. They acknowledged this and collected the handset and even confirmed that another subscriber has been assigned that number. They have now handed me over to attorneys for cancellation, interest and legal fees and have also blacklisted me on ITC and now I can't get credit. What is my recourse?