South African Post office keeps my parcel for 2 months and doesn't reply to e-mails or phone calls

I have an international parcel that was posted LAST YEAR in November and which arrived in South Africa on the 8th of December. Since then I've not heard anything about this parcel from the South African post office or SA Customs

I have tried e-mailing them several times, I have tried calling them over and over, but nobody picks and nobody replies. Absolutely the worst customer service on the planet. My parcel is sitting with them for 2 months and I don't even have the South African tracking number because nobody will respond