Phone not fixed AGAIN

My LG G3 has been in for repairs 6 times now and all that Vodacom does is do a software update and think the problem will go away, the phone freezes and switches off and I have to remove the battery every time, please look at this video i found on youtube, https://youtu.be/mmOgbyUtd6M the link is of another person with exactly the same problem as what i have but Vodacom simply can not fix this problem....surely it is just a dud phone and not all of them give this problem but if you cant fix it, replace it as i am paying for something that has not worked properly since day one. I am aware that if I don't pay my account Vodacom will just simply cut my line but how far must i go to get this fixed? I hope someone will be able to help me and REALLY try and help me and not just say book it in and when i get it back with the same problem tell me to just book it in again. If this was a problem a lot of people where having then fix it, if it is not, then replace it and take it up with LG, but at least keep your clients happy, it is not my job to fix the phone it is Vodacom's and they have done an absolutely horrible job trying to fix it.