Aquaguard

I’m using Aquaguard water purifier since many years.but no servicing is done since 2 years. I have contacted the representatives ( phone nos.9948564769/8886028965), they say they’ll come but they are not coming. I have contacted over phone with them during the last week They say they’ll come but no one came. I need servicing as clean water is the need of the day. Pls help.