Customs Johannesburg parcels go missing

Is there ANYBODY that can do anything about Customs Johannesburg. Parcels that took 10 days from China to Johannesburg, are lying in Johannesburg for months. There is no response from customs. Now the supplier does not want to ship to SA anymore. As he says, everything goes smoothly until the shipment reaches SA, then the shipment disappears. The supplier is then responsible for a credit. Please someone, do something. There are Christmas presents lying in Customs since October. This can not go on!