Mobile phone was never delivered

I upgraded my Telkom Mobile more than a year ago. I never received the new phone and after numerous calls to their call center this matter is still not resolved. <br> <br> I want to cancel this contract since Telkom bridged the contract. I also want all payments to be paid back since I never received the goods and therefore I had nothing in change for my payments.<br> <br> I can not use the 8ta sim card and I have provided the call center with the number where I can be reached. They use it only to send me a sms with the complaint number.