Ridiculous Refund Debacle

I booked my flights online through Flight Center South Africa as they offered the best option under the COVID flight restriction period December/January. What a BIG mistake I made! My flights could not happen as the airline canceled all international flights from SA. I was never informed by any of the parties. After numerous emails since January, I still did not receive my refund to date. Finally, I received a call from an agent Jimsom Machunu and an email with the refund amount on 09/05/2022. For the three flights that could not happen, they offer me a ridiculous refund. I paid R18 891 and the refund is R8126 (I used one inbound flight on this ticket but did not use the three outbound flights) I was told that the airlines deducted taxes. How am I penalized if the airline canceled? As a customer one expects a layout of the refund and not just a random amount emailed to you with no explanation or breakdown. My unsolved case was even closed by Shawn Lewis. I am not in SA and they keep calling me on my SA number after I requested to call my international number. I am highly disappointed at this stage with the whole deal. I will definitely think twice before I use FC again!