[Resolved]  Aquaguard - Reviva — poor water quality and tastyless

i have purchased a Aquaguard - reviva two years before and subsequently entered into AMC for last two years. But i am not getting the proper service from the company. the water is giving poor odour and there by in my family all the members are fall in fever due to the sewage kind of odour is coming in the water. i feel due to one filter is not changed quite long time there by it is totally got fungied. pls send your service man and get it repaired.
thanks
r.srinivasan.