Worst courier service

Terrible service. Was informed my parcel was going to be delivered between 8:00 and 17:00. At 15:00 I tracked the parcel only to find "unsuccessful delivery, courier attempted to deliver but was unable to complete" This is a business address and had people here all day long. When I phoned the call center I was asked to hold, after 5 mins the call got cut. I phoned again and was told the reason was that the address changed. When I asked when the address changed the lady said 5mins earlier and that I can expect my parcel in the next two days. I never changed the address.