Most frustrating experience

I entered into a data contract a month ago. From day one the router that they delivered didn't work. At my own expense I traveled to East London to a Vodacom repair centre after the call centre could not assist. I again went to East London yesterday as I was informed that he router just needed a new battery. I got home 200km later, charged the new router and low and behold the same problem persisted. The new battery lasted all of 5 minutes and no matter how long you charge it, it is still not functional. I am sick and tired of calling and no results are forthcoming and worse still I have already had paid for this poor service. I want to cancel this lousy contract, but I am told I have to pay three thousand rand and some cents....please release me from the claws of vodacom