horrible service worst network provider in South Africa

I am extremely irate have been on the phone for the last 21 minutes . I have been transferred 6 different times spoke to 6 different people and nobody seems to be able to assist me. I took out a new Samsung S22 in Sept I had the phone for 2 days and then return the phone to MTN campus Square. I was on the phone with MTN for almost 1 hour transferred to 7 different people and nobody could assist me MTN provides the worst customer service ever . I received an invoice today and noticed that I am being charged for a phone that I do not have .

I called back again still nobody can assist me .