Poor service and inconsistent feedback?

A parcel was sent out to me on 02/07/2018. By 05/07/2018 I phoned to enquire when the parcel will be received. I was tols delivery was scheduled for the following day (in other words 06/07/2016). Phoned them again on 06/07/2018 in the afternoon enquiring again when I cab expect delivery, only to be told delivery is now scheduled for Monday 09/07/2018. How is it that a package that was suppose to reach me by 03/07/2018, gets delayed so much?!