Lost parcel

Good day

I would like to lodge a formal complaint about your company. As i had a parcel go missing that was picked up from me almost a week a go and still has not reached the drop off point. I was told when i spoke to one of the workers there that the parcel was droped off at the wrong address and from then every time i speak to someone there they cant find my waybill number on the system . So please can you advise me on what will you be doing to correct this **** UP of yours

Thank you