Mobicel bad phones

My mother bought my son a mobicel at pep now I am not sure who is at fault pep or mobicel. The phone in question was a mobicel p11 2 weeks old now. This phone goes on and off by itself. I wrote in and asked mobicel what's happening and the way forward. The only response please return the phone to the nearest pep branch it will be booked in and inspected to see what's the fault. I know and everyone by know that mobicel isn't expensive. My question was if I wanted to buy a repaired phone I could have gone to a local cell repair shop the phone would still work better but I didn't my mom said she want to purchase him the phone out of the shop or I could have gone and bought it on the street which we didn't. I haven't taken it in as yet i can't take off for this but I return by Tuesday. Either way I don't want a phone that was opened up to be repaired and given back I don't it's not right. All that was said I should return it will take 7days or more to check and returned. Seriously I don't trust i told the agent i emailed please eve after looking at it I want a new phone that wasnt worked on it's **** you buy out the shop to have it returned goodlord then rather credit my mother's account so that they lady don't pay off they phone cause this was a mistake this phone cheap yes but to do this first 2 weeks that's just wrong don't cell nonsense to people then you want to open it up fix amd give it back like that said if I wanted a repaired cheap phone I would have purchased one.