Bad, very bad service

So i have bought a Theremin (electronic music instrument) on the 26/03, it was shipped via USPS International Priority Mail for 700R.<br> The lady at the post office wouldn't give me the local tracking number, she said her colleague who handles tracking numbers was busy on the phone. I said I didn't mind waiting, but half an hour later, no one came to help me and i could clearly see that the colleague hung up the phone a while ago. So I insist on getting my tracking number, the lady whom I talked previously made me write my phone number on a piece of paper and promised she would call in the hour. That was two days ago. I came back to the post office, still couldnt get a local tracking number.<br> However I was told my parcel was still in customs in Joburg (apparently its been there for 10 days now), I've asked if i should send a receipt of the parcel, but no one could give me a clear answer or tell me how much longer it would take for me to get my parcel. Please help, international tracking number is CF***US