LACK OF SERVICE

I purchased a LG G3 via the Vodacom online shop in December 2014. From the minute I set it up (just before Christmas) it rebooted without warning stating \Sim has been removed". This has happened 7 times in 1 day. If I'm lucky the device asks me for my password. If unlucky it bypasses the process completely and doesn't detect a sim - I then have to switch the device off and try yet again. I went to hand in the device and was only told a month later that because it was an online purchase they couldn't help me and I had to phone the call centre. I spent the next day (end February) speaking to a bunch of different people"