Refund proofing to be difficult

Booked a holiday to Mauritius through Pavilion Pentravel to depart 25 April 2020. Booking ref V85398. This package is a 5 star resort with business class flights. Package amount is R 79 050.00. Due to COVID now going on for 2 years we have had to rebook ,but with the borders at Mauritius closing at a moments notice has made it difficult to go on the trip. We have inquired with Pentravel for a full refund as this holiday is proving to be uncertain due to the COVID requirements issued by Mauritius and the possibility that we could be stuck there if there is another wave or new strain etc. The agent's response in August 2021 indicated a refund of only R 34 000.00. Presently we have been asked to rebook the package , which will include additional costs and the uncer*****y of COVID still being around. We find it unfair that we cannot get a full refund as the amount of R 79 050.00 was paid in full on the 23 January 2020 , which would have accumulated interest.