Is LG at fault OR Vodacom?????

I have made a complaint to LG about the G3 Beat software, BUT I am honestly not sure who is at fault here. I bought a LG G3 Beat from Vodacom about a month ago. I went there wanting to get a Samsung with which I was very happy since I had one years ago. I had my arm turned by the consultant to take the LG. According to her it was the best phone on the market at the time. a Month later the phone is no longer working properly, freezing each time you make a call, send a message, ect.So bad that I have to remove the battery and restart the phone, 6-10 times daily!! it is ridiculous. I took it back to the same Vodacom branch where I was told that I will have to send it in so it can be loaded with another software as my phone has \the latest software"but doesn't seem to work. How can Vodacom not tell you that will have to send in your phone a month later for updates"