DTDC — H36181591 courier Not delivered

I have not received my courier from DTDC H36181591 and courier guy mentioned succesfully delivered in Nagole Parcel Brach and i have visited their nagole parcel branch they have searched everything and said that they dont have parcel in branch give us 1 day time will check and get back to you. Next day i have called them and they said courier guy didnt return the courier to them and that guy is admitted hospital now give us 2 days time we will check and back to you. i called them again after 2 days and they are not responding.
I have my original education documents in it it is been 10 days i didnt get my parcel