Review Bad service

I sent a parcel on 27 Dec from Postnet Stoneridge to Postnet Pinetown, today around 14h15pm I called Pinetown as the receipient has still not received notification that the parcel can be collected.
The attitude I received from your staff member called Nathi has made me consider using alternative courier services.
He told me he has the parcel, and that we customers have a mentality of deleting messages without reading them. I told them I wouldnt be following up if the message was sent, I know for a fact that it was not because the recipient has been enquiring where the medication was. Then he went on to tell me hoe he was the only one working through the December and had thousands of messages to send,without taking any accountability for the mistake.
It could have been a mistake that he didnt send the notification but instead of acknowledging it, he became rude with me. I dont appreciate this kind of service, its completely different from the service I receive at your Stoneridge branch in Greenstone.
Someone needs to take that Nathi for Customer service training immediately before you lose more customers.