Reimbur*****t of flight ticket by mango

We booked flight for the 18.06.2020 on February 2020 for leisure at Durban, unfortunately the covid 19 came to our s****s during that month and we were totally locked down. We then decided to book again during November 2020 before the president adjusted us to level 3. The airline refuses to give another vouchers claiming that we will forfeit because we can't cancel in exception of funeral case. My question to the airline is that they know very well that we can't go anywhere on level 3 lockdown and it's the president mandate . Mango airline please reimburse us or give us vouchers.