Flipkart — Installation technician issue

Address: Flat No 204 , Sapphire Appartment . Shirure , near maurya hospital

I have purchased MY AC on 14th march and get delivered by 24th march.
An engineer got allotted for 25 march for its installation.
I got the name and contact details of the technician for installing my AC on 25march morning by text .
During 10 AM to 2 PM, i tried to contact with him but he did not respond.
Again i tried to call him by 2:30 PM, he told me that he will visit tomorrow.
Near about 5 PM he call me but did not speak, again 6PM he call me and got ring once and disconnected.
Now i have got the confirmation in evening that he has mentioned that customer ( I) am not receiving the call.
I have tried reschedule the installation appointment, now it is showing 28th march, it got more delayed .
From a trusted Baand it can not be tolerated.