Vodacom refuses to execute warranty repair

On 20/10/2017 my mobile phone back lighting on the screen stopped working. Then the battery also overheated. This is a LG V20 that is around 6 months old. Phone has never been dropped, nor exposed to any water, etc. This failure happened in my office while I was sitting at my table and the phone on on my table. According to Vodacom I now have to pay ZAR 8 131-87 to repair the phone since the technician says there is corrosion and thus there is "water damage". When I talk to the call center all they say what the technician says and thus I am liable for the payment of the damage. I cannot talk to anyone else. Cannot move forward to query this. So, bottom line, Vodacom does not honour their warranty obligations. Big message for any person out there thinking of staying with Vodacom or getting a new mobile phone through Vodacom. I do not know if this is an LG policy of even a Vodaphone policy (Vodaphone is connected to Vodacom here in South Africa). Vodacom is becoming the pariah of the mobile phone industry and service provider in South Africa. Lesson for everyone to take note of.