"Overnight delivery" but its 5 nights already

My parcel was handed in at Postnet Mall of the North Polokwane on Saturday 12 November 2022 and paid for overnight delivery. It is now the 17th November and still has not been delivered. The tracking online still reflects the last scan as the one in Polokwane on the 14th November. The postnet call center phone number does not work. I sent 2 emails via the postnet website 2 days ago and stil have received no response at all. I won't use postnet for overnight deliveries ever again.