GMS Worldwide Express — missing parcel from surat

Address:

560048

Hi, i ordered material from surat n they sent the same by gms courier n it reached bangalore chamrajpet branch on oct 13th, 2017 n it's still not delivered to my address at hoodi. There is very poor response from the branch people. They won't pickup the call also, even after calling more than 20 times. They gave me delivery guy number, which is not reachable at all. When i call them and ask about delivery guy, they are telling that they are not responsible for that. I don't know when will i receive my material. I don't know who will take responsibility, if i loose the material. Please let me know how to deal with these guys, thank you.