DTDC Courier & Cargo — Two parcel of different pin code is delivered in one location

I have submitted two parcel to dtdc baguihati branch on 15th September 2021 for two different pincode and different locations. but unfortunately one of parcel haven't been delivered yet to the particular person.but instead of that when we are trying to track the parcel in dtdc it shows that two parcel has been delivered in one pincode.and now my question is that why the two parcel consignment number K[protected]pin code 700084) AND K[protected]has been delivered to one location 700129, who is responsible for this blunder ? I have contacted their customer care and booking branch but they are not responding over all.