CANCELLED THE CONTRACT 5 MINS AFTER I RECEIVED THE

I have called the call centre on Monday and spoke to Sibongile to upgrade my contract , as soon as I received the contract via email, I realised that this is the wrong phone that I want. So I called and spoke to about 10 people telling them to please cancel this contract , so that I can go to the store and do my upgrade with the correct phone that I want. Called again on Tuesday ,and eventually spoke to Sibongile,to please send me an email or sms telling me that this contract is cancelled , to date no response from Cell C, The phone was delivered by the courier company on Tuesday at about 1.30pm,which I did not sign for. I have send numerous emails to customer service, still no response.