Because of Pentravel's incompetence I have lost R17000

Booked a honeymoon in Dec 2019 for Sep 2020 with Pentravel to Mauritius. Indicated wanted to fly with air Mauritius. The agent Sasha-Lee from the Bedfordview branch, Johannesburg insisted I go with SAA because they are cheaper etc so I changed to SAA. Now because of corona and SAA woes they (SAA) have given me a voucher for the value of the flight tickets.But I have insisted all along that I want my money back. I was insisted with Pentravel's insurance company with fully comprehensive but they refused to do anything about my flight tickets. I took the advise of Sasha-Lee because she is supposed to be the expert and Pentravel the professionals, but i will never use Pentravel and Thompsons travel ever again. These flight tickets cost me R17000 which i am now going to loose. To say i am upset is a gross understatement.