DTDC Courier & Cargo — tracking status h80034661 is successfully delivered without actually delivering the courier

Address:

YSR, Andhra Pradesh

H80034661 tracking status is showing successfully delivered without delivering or even giving a call to me (Customer) k yuneela chowdary.
On calling the office at kadapa (The courier address is kadapa andhra pradesh) they are not even responding properly and asking me to call after 1 hr as they also don't know and they have to know. How can status be changed even without giving customer a single call / without me actually signing on courier.