No flight voucher & no explanation!

We had flights booked to Cape Town Airport from Durban Kind Shaka Airport, departing on the 3rd of April 2020 and returning on the 12th of April, 2020. When COVID-19 hit South Africa, I contacted BA to cancel our flights and apply for a flight voucher, two weeks before our departure date, before we were even put in lock-down. I only received a response from them a week after our departure date (3 weeks after my initial contact), to say we don't qualify for a flight voucher. No refund, no flight voucher and no explanation as to why we don't qualify! Even if we wanted to still proceed with our trip, our country was on a nation wide lock-down over that period and we would not be able to travel! To date, we have not received any response to my complaints and no contact from BA! Shocking!