Vodacom account is pathetic

Elite mobile called me and asked if I wanted to upgrade my contract but when I found out about the hidden costs I cancelled the contract and didn't even receive the phone. I have all my emails confirming cancellation. Now vodacom call and threatens to blacklist me as my account is in arrears. How can I pay for a phone I have never recieved. I want this sorted out because if they blacklist me I will sue. I never received the phone and have all my emails for the cancellation before the phone was delivered. This matter is still not resolved as they do not listen when I say I didn't receive the phone. I had all the right to cancel the contract within 7 days and I did so within the 1st day.