Air Ticket Refund flies out of Air Mauritius' window

I made a booking last year to Mumbai via Mauritius. However, due to the Covid 19 epidemic, I dont feel safe to travel just yet especially of our age. I sent an email to air mauritius reservations informing them that I wish to travel next year Sept. They want me to pay an additional R5500.00 per person for this change. Or they are willing to give a voucher to the value of the ticket plus 10% on the air fare only. They are not prepared to change my booking to the new date at the same rate that I paid. This is grossly unfair as I did not change my bookings on my own wish but circumstances dictated the change. Air Mauritius does not want to compromise NOR are they willing to give me a full refund for my bookings. They are unhelpful and simply ignores all mail sent to them. Before, my request for a refund, they were always trying to give me options, but as soon as I asked for a refund, nobody seems to work at the offices and a "dont care attitude" is displayed by Air Mauritius staff. They are ungrateful to loyal flyers like myself. Disgraceful behaviour.