Parcel untraceable _ Bad Attitude

I bought a few things online on wish.com, and the expected delivery date was 14 Jan 2018. My local Ulundi post office employees have done all they can to assist because my package has not arrived, i call almost daily and they assist without getting annoyed. So finally today i asked for the number for customer care assuming they can do more then what a branch in a small town can. I spoke to a lady Khanyisile, our line was not good but i heard as much as i could which was, i should not fight with her, its not her fault it has not arrived, when you post a letter you just throw it in the box and hope it reaches the other person. She did not ask for the tracking numbers she just insisted when you post a letter its untraceable you hope it reaches the other person. At some point during this lecture i was being given, she hung up. I need to know where is my parcel is?