Please help

I bought a flight ticket for me and 2 kids. I had to rush to Limpopo for an emergency b4 lockdown and was locked up this side. The flight was cancelled die to the extension which I understand. Kulula only send an sms to say that the flight is cancelled and nothing else. I had to make a loan to afford the tickets. They didn't even change the funds to a voucher for me to use for another booking. Their tickets are also now more expensive for the 3rd May. My bank can't get a regund until after 12 months . Kulula please help. I would like to rebook but cannot because you have my funds locked up.