Vodacom please help with bad service from LG

I recently upgraded my cellphone contract and received the new LG G4 cellphone. This device I had for just over a month and the WIFI failed on the device. I then contacted LG South Africa and asked then what to do with my device as its was almost brand new and had failed and they told me either I could take it to Vodacom for repairs or to them directly as it was under manufacturers warranty. I opted to take it to LG directly as I was hoping it would be a quick and painless swap out of the device. 2 weeks later and not a word from LG I started to get upset and I complained to LG where a service representative by the name of AMOS contacted me. He told me the device was indeed faulty and would need to be replaced. He said because it was through Vodacom he would then arrange the replacement be sent to me via Vodacom and promised me that it would be latest one more week and Id have my new phone. Needless to say almost 4 weeks later Im sitll waiting for my replacement device. I am not sure what to do I am extremely unhappy with this whole situation. I just want a working phone back but no one seems interested to help me at all.