Incredible connection Sandton

I bought two iPhone 11 on the 8th of August and one is working perfectly fine and the other one has issues regarding the battery, I brought the phone back and they advised that they will take it to their approved supplier so that they check what the issue is, I gave them the phone and after two weeks I went to collect the phone, they advised that they did not see any fault on the phone and the phone passed the assessment test. I took the phone back as it was on and it looked like it was working just fine two days later the phone was sitting on 1% battery life even when I charged the phone it would still be on 1%. I went to the store and I advised them that the phone is giving me the same issue and I was told they will have to book it in again regardless that I collected the phone from them the previous week. i was irate and i requested to speak to the manager who had attitude his name is Pule. i told Pule that i haven't enjoyed the phone since I bought it from them could they please give me another phone or my money back because it cant keep coming to the store for the same thing now coz its time consuming and its costing me money to go to the store every time. the service is terrible because when you call the store they don't answer phones and if they do the consultant will advise you that they will transfer you to someone only to place you on hold for the longest time. I still have the iPhone 11 with me and it is off and does not charge. I wanted to make my life a bit easer and thought let me but a phone for myself and my sister only to make my life a living hell. each phone amounted to to R11 768 so I don't know how to feel now because its the same as taking my money and shoving it down the drain.