Dsv keep on promising to deliver but no delivery is done

I was supposed to receive a parcel from Mtn today, between 13h00 and 15h00, I was told that the driver calls 30 minutes prior, I have received no communication from the company and the line does not go through when I try to call them, this is really frustrating as I had to wait at work for an hour for a parcel that did not come, if you want to save yourself from stress don't take an mtn contract via the online route, there's no accountability and the dsv courier service is very poor