I received a message the first day that I was going to receive my parcel before end of the day, however the parcel was not delivered

I received a message the first day that I was going to receive my parcel before end of the day, however the parcel was not delivered. I called their customer service and I was assured that the parcel was going to be delivered the following day. The following day I received a message again and the parcel did not arrive. I had to send an email complaining and my parcel was delivered on the 3rd day. I was frustrated in a way that I wanted the courier company to return my parcel where they got it