Continuos poor service

My wife and I are trying to upgrade on the black Friday deals when we tried doing it online there was a upgrade pending notification on her cell number. Upin calling MTN they saw its an upgrade that was not fulfilled by them in 2023, they struggled to cancel it and we had to wait for 6days where nobody phoned us back to tell us if the deal was canceled, to day 21/11/2024 my wife had to phone MTN again to see if it is canceled and if we can do the upgrade they sent her from pillar to post and eventually when they wanted to assist her after the agent could not even find the contract deal on the system, they tell my wife that the phone is now out of stock, after they have tol her that there was 5 in stock and then reduced to 3…we have now lost out on the phone that we wanted because of their poor service and nonchalant attitude and now they do not care of the outcome. They have not told my wife if they will get stock again or not. This is my third incident with MTN whereby i paid a contract for 2 years that i couldnt use their bad service continues and is *********ly structured. How is it that they continue to serve us with this low interest in client well being?