Canva Pro subscription cancelled after duplicate charge refund on Apple ID

I was charged ฿1,850 on July 6th for a Canva Pro yearly subscription — which is correct.

But then, on August 2nd, I was charged another ฿1,850 by Apple for the same thing. I only have one Apple ID, and in my purchase history, I only see the first payment.

I contacted Apple Support, and they refunded the second charge. But after the refund, my Canva Pro subscription got cancelled, even though I still paid once and never requested a cancellation.

Now I’m left without access to the subscription I paid for.

Can someone please advise how to get my Canva Pro restored without paying again? Thank you

[Re-Titled by Moderator]

Original Title: Duplicate charge