Unfairly treated,.poor service

I bought cell phone on 25/7/2020 @ Pep store Greenstone mall.The cashier Winnie never explained full T&C.The only thing she said was that I can change the head sets should I want to do so within 7 days.She never advised of the manual should I need any info.27:07/2020 I returned/exchange the phone as the person I bought it for wanted WhatsApp but Fifi refused.She told me to wait for do called mananer Zandile who will help me.I waited for an hour.tired,hungry as I'm a person with cormobility.Zandile refused too after respecting story 20 times which was so unprofessional of Pep store staff.She says she cannot authorities the refund but will tell Winnie who was the cashier that day to take the phone & give my money backZandile put me on the phone & the other lady was very rude .She was shouting at me,telling me there's nothing she can do,I'm waiting her time iasshe was having quality time with her family,She treated me like piece of trash,disrespectful.The service so poor,so pathetic.they don't know what a customer is.the worst is they don't have product knowledge whatsoever They must all go for training seriously.They treated me like a *****.i was so embarrassed as all the customers were looking at me.The other old woman was treated poorly as left unattended. & she left the goods that she was supposed to buy.It' was really painful.THey don't deserve to be in a retail business if that's how they're treating customers.That was run about after 4pm when left.Thay's psthetic..i wouldn't have bothered to come back if from the start Winni explained how the product woks & T&c as well. I left the phone,receipt with my contact numbers with Zandile to sort it out as she's the manager.to call me back but I'm vain.I need this resolved please.With this social distancing ,my heavily risk is at stake.May someone higher put herself:himself in my shoes.May someone rescue me.Thanks in advance,