Take back your faulty phone

I purchased a cell phone just over a week ago, from day two i started having problems with it. Tried to call the store several time, no one ever answers. On the 7th day I go to the store, tell them that the phone is faulty and I need it replaced, but the consultant opens the terms and conditions on the receipt, tells me it cannot be counted as an OBF cos its day 7, then goes further by trying to count the hours from the time it was bought to prove to me its past 7 days. I stormed out, called the store and eventually someone picked up, I spoke to the manager of the cell counter and after explaining when the phone was bought agreed that it was still within days. Anyways he promised to call back and he never did. Im sitting with a new phone that never works half the time, loosing out on work cos no one can get a hold of me . All I want is what I paid for and that is a working phone. Edgars dont tell me about OBF, cos that act is no longer since the CPA came into play. So give me a new phone or my money back