Pathetic customer service

This is by far the worst customer service I have ever received from a courier company from switchboard all the way to the top. How can such a big company have no information systems to keep track or effectively keep track of parcels received? The employees are rude, full of lies and empty promises, I wouldn't be surprised that there's no recordings or QA for their calls either. I sent a parcel last week Thursday from Postnet Vincent in East London to Postnet Midrand Town and it is now Thursday of the following week and I'm still waiting for my parcel. I have called numerous times and promised to received my parcel the following day ( 3 days in a row) and on Tuesady I was told that I can go collect my parcel at their warehouse because its on the floor waiting to be sorted (by the way according to the shipment tracker it shows that it had arrived in their JHB warehouse on Sunday, just past 3PM) and when I got the time to go today the service consultant tells me its will be a waste of my time because they have no way of tracking where it is all they know is that its somewhere in the warehouse... so I must guess the waiting period ... Today I called once again and when I asked to speak to the manager the service consultant tells me no management is available and when I asked for the email address for the manager and realized he might not send it I told him I'll wait on the call and drop once I get received it from his email address and yes you got it.. he hung up on me. Postnet Vincent followed up with them after my call, they told them that the director will see to it and they will call back in 30 min... that was amount 2:30 it is now 5:40 and counting. This company is a tuck shop I tell you. In all this I have lost so much money because this parcel are orders for my customers and the guy who picks them up for the Lesotho clientele has left today, now my business reputation is dented and business lost! Thanks a lot!