CPA breach

I took a contract out in Sept '15. Travelled out of the country and couldn't return the device within the 7day exchange period. Took the device in to Vodafone when I returned as it was overheating and the batter life was poor. The device was sent For repairs repeatedly and even replaced but I continued to experience the same problem. The repair history will prove that the device has been more at the repair centre than with me. I am paying for a contract that I don't have a phone in posession and Vodacom is in breach of not wanting to OBF the device as i Have numerously requested within my CPA right. I haven't received any updates despite emailing requesting an update.