5-day Priority Mail Package Taking 3 Weeks

A close family friend in the US had some items of mine at his house, and I needed them. He then ships them down to me using USPS Priority Mail (which is a 5-business day delivery option). The package was shipped on the 8th from the US, took 3 days to get to JHB International Airport on the 13th, they processed it on the 15th, and it's been with customs in Cape Town since the 16th. I have been calling them every second day ****erally) and they have been giving me different stories, and today, they came and told me that customs still has not even processed my package, and that they can not give me any estimates of when it could be processed and that I just need to wait and see. This for me is disappointing and appalling as no one is helping me regarding this, and I will have purchased priority mail for no reason, because no one is going to refund my money. This service is the worst I have ever received.