UPGRADED PHONE OF 33DAYS NOT WORKING! I WANT A NEW ONE

I did an online upgrade to my Telkom Mobile contract and received my phone via courier on the 5th August 2019. phone was in operational condition up until the morning of the 7th Sep 19 where it just never switched on again after i tried to restart my phone. phone never fell. i found this weird as the phone had only been 33 days old!. i then took off time from work and went to the Telkom Kenilworth branch where i explained my situation. the IT gentleman(i did not jot down his name) advised that i would need to book in my phone and repairs would take up to 21 working days! i am in sales and really need my phone. i then asked if i will be supp**** with a loan phone as i cannot be without a phone due to my work. he said "no" and that i will have to get a phone in the meantime. i cannot understand as this phone is only 33 days old! i am not happy with repairs being done on my phone at this early stage and would appreciate it if i could rather get a replacement rather than a repaired phone!!