not sure what process they put individual or FBA sellers through, but i doubt they do before hand checks for counterfeit products.. they have pretty stringent checks to ensure sellers are legit and you can contact amazon support if you know for a fact it is indeed counterfeit..
safe to use your credit card..
my latest order was here within 14 days on standard shipping.. done via Aramex and i paid amazon for all costs including customs, tax etc when i ordered my item.. make sure though that your item ships to SA.. you will get estimated shipping time and total cost when you add your delivery address to your account and add item to your cart..
as for mzansi sellers buying in bulk from amazon and ripping us off, better chance that they are buying in bulk from chinese sites in bulk and ripping us off...