Worst Service Ever

I recently bought a Premio A10 on the 29th of November. Upon purchasing it I enquired about the phones on which one is the best handset when it came to these type of phones. I was advised to take this one. I was not made aware that 2G phones do not work properly (via network) when it comes to outskirts areas. I had the phone from Wednesday till Friday and the phone was on Emergency Mode 80% of the time. I went to the store today (2nd December) and I was told that they do not do refunds on Weekends of which it was not disclosed to me, not anywhere is it written that they do not refund during weekends. My 7 days turnaround time to return the phone ends during the week and I cannot afford to visit Blaauw Village Pretoria North during the week as I'm at work. I urged them to please call customer care on my behalf and customer care told me that since the service provider (Vodacom) does not confirm that there's anything wrong with their network and the phone is not faulty then they won't refund me. The lady at the store tried to resolve this for me by calling the manager as the manager was not working today and she told me that they won't assist me nor authorize anything, I need to listen to what customer care is saying to me. This is really unfair to me as it defeats the purpose of purchase, I need a phone where I can receive calls whether I'm in a central business area or an outskirt area.