No Phone and no Response only promises

I was contacted to renew my contract. Received the phone and 5 days later had a problem that the phone did not want to switch on again.. I contacted and reported the problem . I was informed that since I reported the phone within 7 days of delivery I will be given a new phone and they will pick up the old phone. On 29 July the old was picked up and since then nothing. I contacted the call centre again who told me that I should have been contacted or received my phone within 3 -5 working days. In the mean time I received a SMS that my phone was received and logged for repairs. I do not want the old phone back I want a new phone as promised. Well guess again, no phone no communication BUT I have been paying the new fee already. <br> This leaves a very bad taste in the mouth and I want to cancel the contract.