iPHONE 6 SCREEN LOOSE 2 MONTHS LATER

My nightmare with Cell C continues,after waiting for 3 Months to receive my upgrade phone I have to endure another month without a phone as the screen is loose.I finally received the phone at the beginning of February15 for an upgrade that was done and confirmed finalised in Nov.14,Now 2 months later the screen is loose went in to the iphone store where they told me that the screen should not be loose and If i had bought the phone instore with them they would replace it immediately.This is not the case with cell c,I went to a store and called and I got to be told that the phone must be sent away for repairs,how does a phone that is 2 months old and through no fault of mine as confirmed by istore need repairs. I mean the 7day return policy is a *******, how many phones break or experience faults within 7days.Why is it that the warranty is not the same as that of the manufacturer.I upgraded over the phone and now i must send my phone away with no loan phone, this is unacceptable.At a branch I get to be told that I will only get a basic phone as a loan , for goodness sake this is ridiculous as this no fault of mine. I want this phone replaced, do not want to repair what i didnt break