Bad customer service

A couple of months ago, I went into the Postnet in Eastgate to courier a phone to my cousin in France. Her phone had been ****** and needed to be replaced here in SA as her contract is here. I went in and filled in all the paper work, paid my money and left. Three weeks later, when the phone had not arrived, we contacted Postnet and were told that DHL had lost the phone. DHL launched a half hearted enquiry and essentially told us there was nothing they could do. We then approached Postnet as we had insured the package. We there told that although we had ticked the insurance box and filled out the amount we wanted to be insured for, we had not be charged for this insurance and as such they refused to cover it. I have been in to postnet TWICE trying to get the manager / owner to speak to me about this situation and resolve it. In my mind, it is not the customers fault when the cashier charges them the incorrect amount. Regardless, I have never received any feedback on the matter, the manager / owner has never bothered to make contact and I refuse to let them get away with this kind of SHOCKING customer service. I am posting this here mostly as a warning to other customers!