VERY BAD SERVICE FROM PEP

I returned a parcel via Postnet to the wrong address. Instead of it going to the supplier where I purchasedown my, item, the address I was given went to the Pep store at Lynn Ridge Mall. A lady from that store phoned me to infoI'm me of the mistake. I asked her to please contact Postnet to uplift the parcel and return it to me here in Durban. She told me outright she couldn't do that. I contacted Pep Head Office and spoke to a MBALI, she refused to give me a surname. I explained the problem to her, and asked her to do me a huge favor, to phone the branch at Lynn Ridge and instruct the lady there to contact Postnet to uplift the parcel and return to me COD. She Also told me outright she couldn't do that and I was to get someone from "outside" to do it. As I'm in Durban, I couldn't get her to explain what she meant by someone from "outside"?? I asked to speak to her supervisor, and was told she/ he was busy and would phone me back. That was 3 day's ago, and I'm STILL waiting for that call. All I'm after is to have my parcel returned to me at my cost. BEFORE it goes missing for good at Pep store, Lynn Ridge Walk Mall.