Utter Lack of Service from Customs and Excise

I have a parcel shipped from the US on the 9th of June 2018, which arrived in South Africa on the 15th of June 2018. I only have a foreign tracking number, which was provided by Aramex and tracking has been showing "Customs Clearance - In Progress" since 15 June 2018, 03:01 PM. I have tried calling Johannesburg Mail Centre and EMS on FOUR different numbers - NO response. It just keeps ringing. No one can tell me why my parcel is being kept at customs or how long it's still going to be. The parcel was scheduled to reach me by 25 June 2018 and I still don't have it, because "Customs Clearance is in progress". This is really unacceptable and, as a tax-payer, I am truly disappointed by the lack of service provided to me by an institution that is supposed to work for the people. Also, I have already paid for shipping and import when I bought my item online, so I DON'T see why I should pay again/more once it reaches SA customs. I am expecting two more parcels tomorrow (28 June 2018) and fear that I will be stuck with the same problem for both of those parcels.

Why Customs? Why are you making this so difficult for people to get the items that they've already paid for and making them wait?