Unacceptable service from PostNet - don't trust your parcels with them!

On Thurs 19th Jan I paid for an EXPRESS DELIVERY from Cape Town to Jo'berg, a small parcel weighing 0.5 kg. I was assured it will be delivered, to the address given, on 20th, or 23rd at the very latest. Today is 25th and my parcel is still "Under processing at operations facility" according to their tracking facility. This has been the case since 01.15 am as per their tracking : Johannesburg, South Africa 1/20/2023 1:15:00 AM Under processing at operations facility I have emailed the Table View branch yesterday but no acknowledgement or reply. I phoned 3 times yesterday and the phone was hung up on each occasion. I rang this morning and was told that they understood my frustration and someone would call me back shortly. That was about 3+ hours ago and still no call and still no email reply or acknowledgement. I thought using a well known courier brand my parcel would be delivered within the timescale that I paid for. How wrong was I. Nobody at PostNet has had the decency to get in touch with me. I have also tried to contact their customer service department by email - no response/acknowledgement, by phone - no answer.