Bad services MTN

I have upgraded my phone on the 31 December 2020 and I took an iPhone 12 mini with the watch. I was so excited until I realised that my phone mic isn’t working, cannot put it on speaker, rang when it feels like to. I then went to MTN store in Gateway when I have done my upgrade to my surprise, I was told that the phone needs to be booked in for repairs, I should have returned it after 7 days, but to my surprise again when I checked the issue online, there were so many people who has their phones with this same problem. I then realised that MTN should not even try to sell a phone that you know it has factory issue not to even unpack it to the client that we are having this issue please test it well and return if so, instead you guys kept quiet and not say a word about the issues of this phone. I had to pay January instalment with the phone that I couldn’t use. I am so disappointed with this manner. my phone has been sent for repairs together with the watch so ridiculous, I’m not sure where the watch is going though. You guys can keep your phone and your watch, I’m no longer interested. You may cancel that contract, thank you very much for making your clients inferior