Faulty/ Defective Products

How is it possible to that a product bought from your stores does not function correct, and it is not yet 2 month old. I bought a Microsoft Lumia 535 from Edgars the Glen on the 21st August 2015. However for the past three weeks I have been having endless problems with the phone.<br> <br> On most occasions the phone works fine, but when I really need to have it working the phone drops calls, and my sms's does not come through, sometime the whole unit just freezes and then I am unable to unlock the screen, and I have to reboot/ restart the whole unit to gain access to it again. When I ask the consultant from Edgars Kenilworth Cape Town, how long it will take for repairs, they advise me anything between 6-8 weeks. What must I do in the time my phone goes in for repairs, as this is my only point of contact, not only for personal but for work. <br> <br> I really think that this is unacceptable and that I need to know where to from here. Your assistance would be greatly appreciated.