Kulula credit your flight. NO response

I had a flight booked in March 2020. Which I could not take because of COVID. I asked for a credit from Kulula in Feb2021. Not heard from them since. The automatic reply said 6-8 weeks and please do not submit the claim again this will make the queue longer. They also said you can phone Kulula if you get no response but if you phone them, they say you can only get credit if you email them ?? Strange other airlines has already paid money back or credited their customers.