Incorrect number was upgraded after i specifically indicated which number needs to be upgraded.

On the 06/11/2020 one of your call centre agents called me on on of my contracts indicating that my sim was due for an upgrade and they will like to assist me with the upgrade. I was called using number:***. I agreed to do the upgrade over the phone and indicated that I have two sim cards due for an upgrade and that I would only do the upgrade on the sim only contract, which is the 073***x number. My request was to upgrade my sim only contract with 80G data package. He indicated that he understand and further went on to clarify that I mean the sim he called me on. After he was done with the call, I realised that I did not receive any communication from MTN regarding the upgrade and became curious whether he actually proceeded with the up upgrade on 073******. On 07/11/2020 I call the MTN and explained the situation, they indicated that the upgrade has been sent for approval, but they can’t see which number was upgraded. I must call MTN Monday since the contract department was not working on weekends. After Saturday I call MTN again and they told me that their system was offline they couldn’t assist me. On the 16/11/2020 I went to the MTN shop with the hope of upgrading cell phone number :060 *** and that’s when it came to my attention that the wrong cell phone number has been upgrade. This call centre has been sending me from pillar to post. I have lodged a complaint with MTN even today they have not responded to my request. DO NOT UPGRADE YOUR CONTRACT WITH THIS CALL CENTRE ***.