Telkom Contract - Binding agreement to WORST SERVICE EVER!

On the 20th April 2018 I took a Cell phone contract out at Telkom Sandton City and I received a P20 Pro. That same day I found that the phone was faulty where the notch appear on the phone. As I was out of town I could not take it back however on the 23rd April 2018 I took the phone back to the store in its original conditions along with accessories and I requested the contract to be canceled as I did not have faith in the phone anymore. I dealt with Kingsley and store manager Phillip who sent the cancellation through. After countless visits to the store and phone calls to customer care no one can give me an update. I have received a phone bill of R1600 including my normal number which means this contract has still not been cancelled. As per the CPA and failure out of the box within 7 x days I have all rights to cancel this service and return the phone however it seems Telkom thinks they are above the law. On friday the 11th April 2018 my normal ********** stopped receiving calls or making. When I queried this the store said its because I am on a data contract however I have been using this number for the last two years with telkom working perfect. I am left now with no means to phone in and out and no one can give me an update of the cancellation of my contract. I will ensure I make it my duty to warn everyone I know against telkom and will not leave this here as telkom is breaking the rules of their own contract according to the CPA