First Flight Couriers — items missing in the parcel

Address:

Junagadh, Gujarat, 362265

My friend couriered my parcel on 25/04/18 via dtdc from vit university. The parcel was a guitar. I was vacating my hostel so i had a lot of luggage and couldn't carry everything with me. So, i had placed my shoes and some clothes inside the guitar cover (There was enough space). Dtdc gave the parcel to 'first flight couriers' and they further sent it through gati courier services. They took extra 400 rs from me for packing because they said it was guitar and needed extra packing. While packing, they opened my parcel and removed some items from it (Shoes, blanket etc). The shoes itself were worth 2000 rs. They said parcel will reach after 7 days but i received parcel after 15 days. When i opened the parcel, i found that items mentioned above were missing, and they had put thermocol sheet inside the guitar cover. I don't think they're even allowed to open the parcel. I talked to the first flight courier guy and he said he'll check the cctv footage. So far they have only found one piece of cloth that was missing. My shoes and blanket are still missing. I am trying to contact the guy since a week now and he's not picking up my calls and not even replying on whatsapp.