Phone

I bought iphone 11 on 13 august 2023 the issues was face i.d I didnt mind that..but when I got home I saw that the screen is damaged I went back and fought to report the issues at canal walk but they did not want to help me because I bought at tygevalley branch..they change the screen at tugervalley but it did not even last an hour it had issues again they changed it for the second time..now the phone does not pickup network they sending it to repairs when I fetch it they telling me its not sent..I told them I want my money back they must take their phone ..they dont want to ..what must I do because these people are taking me chance because of my skin colour?..