Undisclosed extra fees. I was nearly forced to pay R3,000 for an order that costed R1,500

Shein offered me free shipping when I placed an order over the minimum amount. I ordered about R1,500 worth of goods. Other or additional fees were not disclosed to me. It cost me an additional R427 to pay for an invoice from an unknown source - which I initially thought to be spam. When I found the invoice, I called Aramex to verify where they obtained my information - and I was told that an additional R1,500 would be charged for late payment if I did not clear the customs charges within a few days. Unfortunately, I am very disappointed...