Untold rules about returning your phone before 7days.

Hi, I bought a phone on the 31st of May 2020 from Telkom Southgate Huawei Y9s. The phone cameras are both bad which I belive are a manufacturing fault cause my Huawei p smart 2018 takes much clearer photos than this one. I called the store reporting my issue and informed the sales rep that I would be coming in to change the phone.

To my surprise I was told that it won't be possible I find this very wired I didn't even last 7 hours with the phone and I was told about a 7 day period to change the phone. I just wanted to change the phone or get a different one. I bought the phone on contract and I am not canceling I just want to change it why is it so difficult. I don't get what could possibly be the challenge.

I have read reviews about how bad the telkom services are, my only mistake is that I'm only reading them now that I have this phone with bad cameras and I am unable to return.