Delivery failed for no reason

I'm expecting a parcel from Vodacom, on the morning of 30/12/2022 I received an sms saying that my parcel is out on delivery. Late in the afternoon I phoned the call centre to follow up and they assured me that my parcel was out and I should it expect it to arrive on that day, but nothing came. In the evening I received an sms saying my delivery failed. This morning as I checked the status on their Website I see the parcel was returned to their premises and the reason is "consignee not available " ...How??? No one even contacted me instead I was the one following up. Disappointing service, in fact appalling behavior of drivers.