How do I get a refund for an unwanted Apple Arcade subscription?

Earlier, for buying a new iPhone, Apple offered me a free Apple Arcade subscription. I did not attach much importance to this and reluctantly agreed to it and successfully forgot about it. The payment for a subscription that I didn’t want to issue has just been withdrawn and it says here that “This purchase does not have an invoice”, so I can’t get my money back for this. What should I do?