Usha Shriram — ro water purifier not installed 5 days over

I purchased usha ro water purifier on 19th jan 2018. I called for installation the same day and complaint no. Given was 48106 and it was said it will be closed in 72 hours. After 72 hours i booked anothee complaint (No.48429) and talked with a senior mr. Prasant sharma but no use. 5 days over since purchase but installation not done. None of their technicians have called yet. Very poor customer service!!