Spice Jet Airlines — worst response with regards to baggage info

Hi travelled from capetown southafrica to hyderabad india.
Luggage was missed in mumbai on the date when we travelled through rwanda. However rwanda did send the luggage on 16th of june to hyderabad through spicejet and they confirmed they recieved the luggage. Been to ariport 3 times but no one there to help. After a heavy followup came to know spicejet handed over the luggage to some other people without any acknowledgement.
They keep on saying # stories daily and very much irresponsible.

Rahim spice jet manager of hyderabd and suman the security manager from hyderabad confirmed they will sort this out last week already and still now nothing been sorted. It's 6 luggages still not handed over and it's 9th of july
Not sure where to file the complaint