Mango not honoring an agreement

I sent Mango an email on April 7 explaining that i booked 2 return flights from CT to DBN for the Comrades Marathon on June 14. Seeing that the comrades was cancelled due to Civid-19, i asked them was my options were. Mango rep**** with the following: “ Mango has made available two options to assist you for your flight that has been effected by the Corona Virus breakout and subsequent Presidential announcements surrounding it. Mango is offering the following two options: 1.1 x Free booking change, with no administration fees attached, barring any difference in fare. 2.24 month, name transferable, Mango voucher to the value of the booking, barring any post original booking amendment admin fees paid.” I opted for the voucher option on April 17. I was promised attendance to it as soon as possible. I regularly followed up. Plenty emails sent. Nothing. Today, April 28, i received the following from Mango, totally going back on their promise: “I trust this e-mail finds you well and apology for the inconvenience caused. Please note some of bookings travelling from June normal terms and condition apply ****il further notice). We are planning to commence our flight operations during the month of June 2020, should our Government relax the lockdown regulations. Please follow up with us once we are allowed to operate again” I am not allowed to fly for leisure or book accommodation for leisure due to Covid-19. The Comrades is still cancelled due to Covid-19. The fact that some flights might operate doesn’t change a thing. Normal terms and conditions can therefor not apply. But none of this matters. I explained mu problem and Mango agreed to give me a 24 month voucher to the value of my booking.