POOR SERVICE FROM MTN, very disappointing

I've made an upgrade via MTN APP, as the say it's quick and easy you can do it from the comfort of your home. That is not true, I've been waiting for my response since the 26th August 2020. I called in the following the day they told me that their system is not working and they have changed me to the new system. I called again on 2nd September 2020, I spoke to about 5 consultants transferring me from one person to another. I eventually got helped by some lady, I've forgotten her name and she told me that my upgrade was successful and they are waiting for stock to come and the courier company will call me for the delivery of the phone. She also told me that if I don't get a call on Monday, I must call in. I called in today and I was transferred from one person to another, I spoke to more than 10 consultants today and I got no help from all of them I've been using my airtime to call and I get this poor service from MTN. I could have listened to my partner when he said I must take the new contract from Vodacom, I told him that I've been using MTN since an early age and I buy my phones from MTN. I'm very disappointed with the POOR SERVICE