INVALID VOUCHER - NEVER BEEN USED

I am not happy with Mango at this moment. During the start of Covid I had tickets booked to fly home but then I contacted Mango and after a month, they emailed through my voucher for my flight to Port Elizabeth and they emailed another voucher through to me for my return to Gauteng. So in October, I used my first voucher to fly to Gauteng to get all my business in order and now when I want to use my next voucher to return to Gauteng, I get told that the voucher is invalid... How when I have not used it yet?! This voucher was for R1 685 and now it doesn't want to work...Am i to be happy with that and just toss it away? I have to be on a flight to Gauteng 18th December 2020 to see to my animals but I cannot afford the flights cash and that is why I was relying on the voucher. I have emailed Mango but of course I am yet to have a response. I am now going to have to fork out money that I do not really have and book a flight with another airline as their flights are a bit cheaper and what I can afford at this moment. I have always enjoyed flying Mango but I am deeply upset by this and that I now have to spend MORE money than I intended, money that I really do NOT have. I am not happy at all. I always raved to everyone how fantastic mango was and didnt really understand why people would complain about their service but now since I have lost my voucher for R1685.00 through no fault of mine,i think I am singing another tune. Nice time of the year to make your vouchers invalid. Thanks MANGO!!!