Every time a delivery comes (or does not come) by ...

Every time a delivery comes (or does not come) by DPD, there are difficulties - it seems to be common practice that the deliverers simply hand over parcels to their neighbors on the street. Today was the summit that I was sitting on the doorstep and received the message that the program had just been successfully delivered. No trace of DPD.
With the second delivery on the same day, I wanted to ask what happened to the first parcel, no information, just unfriendly, and incomprehensible, if you hire people you should also pay attention to writing and word.