Postal Customs Cape Town. Where is my Package?

I ordered a product online from Netherlands. It arrived with Cape Town Customs in February 2018. I have got a tracking number which confirms it is sitting with customs. I have tried to contact them to find out why the parcel has not been released but phone numbers and emails do not work. How is it that a department like Customs Postal Services have no way for the public to communicate with them? It seems ridiculous that a parcel can be sitting being processed for four and a half months. Even if they have a backlog of goods this is still extreme.