Bad service

Good day my name is Keletso and I would like report a bad and poor service from MTN East Gate. I bought a iPhone 8 on contract at MTN on the 13th January 2020 and I only had that phone for 7 days as it was faulty and I returned back to MTN on the 20th of January 2020 to report it as faulty, I was promised that it would be booked for inspection and I was advised that it falls under an OBF service as it was returned within 7days I receive my phone back after three weeks, ever since that day on the 20/01/202 I never from anyone from MTN with regards to my phone i, I then did a follow up on the 20 February 2020 as no one got back to me. When called to check for an update I was advised that my phone was rejected by their Warehouse as MTN store did not provide proper or correct documents they then apologised and promised to rebook it again and update me with feedback. To date I haven't received a call back for feedback instead I'm the one doing the run around go to MTN to check what is happening with my phone but fail to get assisted or get proper feedback last week I then requested to cancel my contract with MTN as I do not benefit from this contract but money every month is debited from my account. They agreed but since then I call my calls are not being answered The guy from MTN who did a contract for me and supposed to be helping is Reagile he takes me for fool and ignores me when I'm at the store to follow... Please help as I don't know what to do at this point II would like to cancel this contract as it's a strain on me.