Annoyed and Frustrated with MTN... Phone in repairs for over a month. No feedback.

I upgraded my cell phone contract to The CAT S31 with MTN at MTN Tygervalley store on the 6 August 2019. 11 days into the contract the speaker becomes faulty and the sim card no longer wanted to read on the phone. I took the phone back to MTN Tygervally on the 18th August 2019 to be repaired. On the 26th I called MTN Tygervalley I was then told that I had to give 14 working days and then should the phone not be fixed I can cancel my contract. (I have this recording on this call made on my phone) After 14 days I went back to MTN tygervalley. telling them I have still not received any feedback regarding my phone. I told them I would like to cancel the contract as I was told I could. The manager of the store came to me and even after I played the recording to her. She processed to tell me he has no authorisation to do so. I need to email her the voice recording and Monday morning she will follow up. After a week I called the repair centre directly. I processed to tell that person about the recording and I would like to cancel my contract as it had now been a month. She told me she understood and said she would transfer me to the cancellation department. I was then transfer explained my whole story only to be told I was transfer to the call centre as cancelation has closed for the day, I must call on Monday. I then left it for a few day more in the hope it would be fixed. By today 23rd September 2019 I have still recived no feedback regarding my phone. I phoned MTN Tygervalley again, however I never got through to the shop, it just rings. After calling The repair centre 3 times. The first time I called, I got hung up on. The 3rd time I was on hold for almost 20 minutes. The got through. Only to be told she can not help me they are offline. I am fed up now this all the excuse. I pay the cellphone contract which included the phone. When I then said that I want to pay a lesser amount I was told I don't pay for the phone with MTN, it is will CAT. I did not sign a 3 year contract with CAT. I signed with MTN. ALL I want from MTN Is a working CAT phone or to cancel my contract so that I can get a new phone. I am using my old phone now, which has a cracked screen, hence the reason I upgraded! Now I just feel like changing service providers and going else where with my money.