Appple Iphone 4s 8gb

I purchase a Apple iphone 4s 8gb at Edgars store in Klerksdorp for R2999 on 18 January 2016. The sales lady told me it was new and the last one in stock. She also told me that I should go and charge it at home then put in my sim and do the set up. They did put in a vodacom sim at the store but the phone was low on battery. I used it for a few days but then put it in the box and keep it in my drawer to take it back. I did charge the battery for 16 hours but the battery don't hold battery life long. I also notice on the box it said Apple certified Pre-owned that was covered with a white sticker with a number P914 1. I have send emails to [Email Removed] and [Email Removed] Yesterday I received a email from Nompumelelo Ndlovu for saying the email will be forward to the Klerksdorp store, reference number ***/GO. Untill at this moment no one else contacted me in this regard. My biggest complaint is about a pre-owned phone sold as a new phone. I want to return the phone to the store, I phone the Klerksdorp store but every time there is no one that can assist me, and I stay in Ottosdal that is 80km from Klerksdorp. Please help me!!!