Tracking overseas orders is virtually impossible.

I ordered from Fashionnova on the 28th of July and my parcel was sent through TNT post. I have been calling TnT to advise on the location of my parcel to no avail. They do not send any notification that the parcel is in SA ( not sure if it is actually) and there is no way of tracking the parcel through the delivery process. I have called countless times trying to track this parcel and was later told by Lusanda Silo ( who was very rude by the way) to go to the nearest post office. I have 4 post offices in my vicinity therefore wasn't going to go to all four. I then went to Benmore only to be told that the tracking number I have does not resemble the "normal" tracking number. Tnt is not willing to assist in terms of giving me a proper tracking number all they keep doing is advising me to go to my nearest post office. I am actually at my wits end at this point and not sure what must be done. Kindly advise how exactly one goes about resolving such an issue.