Pathetic MTN sandton city service

I went to the MTN store in Sandton City L13B- Sandton to upgrade my contract. I've upgraded to a Samsung Galaxy Z Fold4. The sales lady did not explain anything to me about this phone nor about the terms and conditions but my contract was given to me. It was definitely because ITS SUCH AN EXPENSIVE PHONE SO THE SALE WAS PUSHED THROUGH. I came home and realized this phone isn't for not what I like. My contract was upgraded on Monday(14/11/2022). On Wednesday(16/11/2022) I took the phone back to the store to ask them to change it as it's not something I liked. I have NOT USED the phone. I just browsed throught to see the features and realized I did NOT LIKE IT. The sales lady who helped me get the contract, Ipeleng Matshabisa had then told me that because the seal of the box has been opened they can't take it back. I then went to the Samsung store to find out more about this phone and the policy and the guy explained to me that I have all right to return the phone should I not be satisfied. I went back to MTN and the lady still refused to take the phone back. She told me she has spoken to her manager by the name Granny who also said they can't take the phone back. I've never in my life experienced such poor services like MTN as given me. I'm sitting with a phone worth THOUSANDS and NOT satisfied yet I'd still be expected to pay them on a monthly basis for me. Should I not pay I'd be getting phone calls non stop but when I need help they don't want to assist. PATHETIC SERVICE. For all I care MTN Sandton city is trying to buy time to pass the 7days period so I then won't stand no chance in getting an exchange. Today I'm sitting on day 4 with no satisfaction of service whatsoever. I did tell the store that I was going to call MTN headoffice to lodge a complaint and the sales lady said I must go ahead because not even MTN headoffice will help me. DISSATISFIED CUSTOMER. ***