LG Electronics — water purifier service

We are using lg water purifier and its water is acidic in nature.. We are falling ill drinking this water. Several times we try to contact the incharge.. No steps are taken yet for our help. Water is not safe for drinking. No team or members of company try to help us solving dis issue.. Very poor after sale service..
Though we buy this water purifier past one and half year ago, and when we bought this water purifier its ph color is blue and now it turns into red which is acidic.. Even highly acidic in nature.. And not fitt for human consumption..
We have to bring water from someone's else house nd we are facing this problem from few months.. And there are several health issues occurring due to drinking this water. Its my second complaint letter to company. If no steps are taken to resolve are problem.. Further higher steps are taken from our side for this issue.. As water is not fitt for drinking.