faulty handset

I bought a Samsung galaxy star 2 plus on the 30th of may with my foschini account then discovered the battery does not last long as I have to charge it atleast twice a day before I could download any apps. On Tuesday I called the store they said I should bring it back and they would book it for repairs,then Thursday got a call from one of your consultants saying I'm also entitled to a refund then when I took the phone back that same day the staff told me that it's impossible for a refund and that consultant was lying to me and I should call her back and ask for an explanation they forced me to take an option that I'm not happy with and they say I should take another phone instead.is this how you treat your customers do you expect me to pay my account every month for such?