REFUND OF FLIGHT TICKETS UNABLE TO USE DUE TO LOCK DOWN.

Good Morning, In May of 2020, I was going to Israel as part of a tour group. I booked through Travel Start. E-Ticket Reference ZA07858580. I paid for 2 Local tickets to Johannesburg on Mango JE534 for myself and a friend. I also booked and paid for 2 return tickets from Johannesburg to Port Elizabeth on British Airways BA6239. I have over the past two years kept on filling in forms and sending letters and I get nowhere. In Fact - British airways say that I requested after the two years was up. I sent them proof that I have been requesting over the two years and had no reply or some excuse. My latest letter again was given a reference number [#812537] with a promise to get back to me withing 48 hours. Tickets were for Mandy Lenise le Roux and Gail Lydia Banfield.