Pep Cell & Mobicel

I recently bought a mobicel cellphone for my young sister for her to get her school and be able to connect to other kids from her school. We bought the phone on 6th of May 2020 @ Pep Cell in Balfour Shopping Centre. Two weeks later the phone started controlling itself and at first it was bearable but later on, it started switching itself to safe mode and she could not access her apps. On the 23rd we decided to return the phone and swipe it for a better one but they refused. The staff there was so *********** and could not understand our frustration. They say the process will take 4 to 6 weeks and i am thinking, what do we do now? buy a new phone? that's an extra cost that is way out of my budget. Mobicel Glo is the worst phone and as for Pep Cell in Balfour, thanks ladies but your customer service sucks big time.