Parcel went out on delivery 3 times and no delivery

Pls explain why my parcel keeps on going out on delivery and never reaching it's destination I can't keep on receiving an SMS daily but my parcel never gets delivered

The Courier Guy: Hi, your parcel (MML574389) from VChem is out for delivery. Delivery PIN: 983 Track: https://portal.thecourierguy.co.za/track?ref=MML574389