Spice Jet Airlines — flight delayed and left without being contacted the passenger

My son manu ram holding confirmed ticket with PNR B2G8KI undertaking his studies at Delhi stranded at BENGALURU on WED 28 JAN 2015. Holding his boarding pass from Calicut he descended at Bengaluru from flight SG1076 and was waiting for SG 507 your next connection flight to DELHI .He had reported at your office at flight BENGALURU and never left the airport .But your SG 507 flight delayed and took off without taking my son thereby causing a lot of inconvenience to us.When I myself contacted your officials at your office at BENGALURU, they responded with irresponsibility saying my son has not reported in time .But I fail to understand how my son waiting for the flight inside the airport not reported in time.He is stranded inside the airport even now.