Spice Jet Airlines — booking was done via makemytrip but at airport spicejet said no seat available

Address:

Kolkata, West Bengal

Makemytrip booking id: nf[protected]. Booking was done on 18th may for flight no spice jet sg-3220.
When arrived at airport it was told that flight is full and seat not available. After some time they said that there is some technical issue. At the end we got to know that the flight has already taken off.

There is no proper information about anything. Neither spice jet is communication properly nor makemy trip?
Attaching booking confirmation. Ticket was worth rs 8000/- and now full day is wasted. Was having meeting at siliguri all things got spoiled. I want full refund with compensation.