Disappointed

I bought my mother a phone from PEP on the 24th December as a Christmas gift, when we switched the phone on it was dine and when I gave it to my mom she did not switch it on immediately. A few days few I gave her the gift she switched it on and unfortunately it did not work. I then took it back to the store on the 6th of Jan and because it was after the 7 days policy it had to go for repairs and I understood that and the sales lady who helped me told me it will take 4-6 weeks before I get the phone back, that lady was so unprofessional and she couldn't use the store's system and she as joking about everything next to me yet I had to wait before I was helped and I asked to speak to a 2IC (Mimi) pretend to be the manager and she did not even have the time to listen and assist me had to wait for the lady who was on her lunch break. Finally she came and still had to wait because she couldn't use the system. Now 6 weeks has past and I still don't have the phone. On Saturday I went to the store and the manager said it will takes more that 6 weeks, so the first lady that helped me misinformed me? and the store manager promised to do a follow up on Monday 17/02/2020 and she promised to call me back, to date no call from her and still don't have the phone. :-(