Apple Won't Replace Phone_Faulty Battery of Brand New iPhone

I bought a new iPhone from Telkom and it presented a problem under 7days of purchase falling within the phone replacement period. I am not sure if it is the Apple brand or Telkom, but now am suspecting Apple. The phone's battery presented problem as soon as I started using it, and it's been over 2weeks and I am now using a very old phone with a broken screen. As Telkom is only a service provider and not manufacturer, Apple has released a faulty product and now Telkom is giving run arounds. Apple, your competitors' phones out there seem to be doing a much better work than you in guaranteeing the workings of their phones. For the high price paid, perhaps I should consider changing to a Samsung or even Huawei. REALLY UNIMPRESSED!!!