MTN Upgrade

I upgrated my contract with MTN in September 2020 online. When I received my account end September 2020 it was almost double what it should have been. I contacted MTN on facebook and they rep**** to me on the 1st of October that they added a booster without my permission. They escelated it to CCI SA. After multiple correspondances MTN admitted to the fact that they made a mistake. They confirmed it by listening to the recording that was made when I did the upgrade. I was informed that they can not fix this problem because of a system change. Now I had to take back the new phone to a MTN francise or branch. I explained to them that I work very long hours 6 days a week. I went to a francise and they said it must be branch. I phoned CCI again and they said where I could find a branch. The nearest branch that could accomodate my working hours was Menlyn and I stay in Kempton Park. Today I went there and waited 2 hours to be helped. When I got to the counter I was told they can not help me as a piece of carton that the phone was wrapped in when I got it is not in the box. Im fed-up now. I have to pay for something I didnt order and I have to fix MTNs incompetance. My goodness and still have to pay the enormous bill while I dont even get the booster airtime and data. If this is not sorted out very quickly I will have to take this further. And believe me after 20 years I will leave MTN and go somewhere else. Your service really sucks.