SAA - Pathetic Customer Service (REFUNDS/TRAVEL VOUCHERS)

I had a flight booked with SAA for the 8th of April 2020. Prior to the announcement of the National Lock Down, I contacted the Airlines to request for a full cash refund / travel vouchers - the Agent advised me that I should contact the Airlines in the first week of April 2020 as the Airlines were not issuing cash refunds however they were offering travel vouchers valid at the time till February 2021. Naturally , I could not contact them during the start of the Lock Down. I tried calling the Airlines over numerous occasions to no avail, we have not heard back from the airlines. I demand a full cash refund, do not hold people's money to sustain the airline. I need an Agent to contact me urgently regarding the next steps on how to resolve the above.