LATAM Airlines complaint: Cancelled Flights

I bought tickets in Feb 2020, prior to the world going into lockdown to fly from Johannesburg via Sao Paulo to Buenos Aires.
I contacted Latam via email and contacted them via phone in January 2022 spoke to after restrictions were lifted to rebook my flights or get a refund.

I was advised by Carlos on the 24th of Feb 2022 at 16h24 SA time that my tickets had expired and thus I could not get a refund. I questioned how they could expire as I did not personally decide not to make use of them. A world pandemic did. He advised that I had until June 2022 to make an involunatary change. He ed that there were flights.

I phoned and spoke with Sebastian on 7/3/2022 at 16h08 to rebook my flights only be told sorry there are no flights. I should phone later and see if there were flights. I spoke with Adriana 7/04/2022 at 15h33 and was advised still no flights.