unsatisfying service

Tracking number; pe ********** 95za. I am not very happy with the service I have been receiving with my local post office. I posted a parcel to go to Brits for a client on 21/06/2018. I have been calling daily trying to track the parcel, the best answer I get is " it left us on the 25th and was received by our depot in Pretoria on the 27th. We dont know when it will be sent out " Bear in mind I'm sitting around bored with nothing to do, I have to ensure a client receives the service they deserve . How on earth do I tell a paying client I don't know when they will get their goods????? Surly this not considered a fair.