The issue is displayed on the screenshot below.
As you can see, the cart’s total is ZAR3,295, but the «Shipping Methods» secton does not display rates and shows a wrong message: «This shipping method is only available on orders greater than R500».
It is a Magento core bug.
To fix it, you should specify your default customer country not only in the «General» → «Country Options» → «Allow Countries» option, but in the «Tax» → «Default Tax Destination Calculation» → «Default Country» option too:
magento.stackexchange.com/a/124350