Appalling Service RAM

I had a delivery scheduled for today from Vodacom. I've since received a Whatsapp this morning claiming that there was a failed delivery attempt as no one was home. How is this possible when in fact I AM at home, and no one in the house heard a car hooter or car at the gate, nor did I receive a call alerting me. I've tried several times to call them and each time my call gets cut off. The only place I can communicate with them is Whatsapp, which only provides new delivery dates for next week. I don't understand how can they say they've attempted delivery and no one was home, when there's multiple people at home. I'm also not sure of my availability next week due to work commitments, I further don't understand why can't they deliver still today. Worst delivery service I've dealt with!