If from Apple, you may consider a chargeback. Or suggest that you'll do a chargeback if they don't refund you when you next check on the status of the replacement.
https://discussions.apple.com/thread/250418193 https://discussions.apple.com/thread/6474540 https://www.reddit.com/r/applehelp/comments/enfza3/ramificat... https://www.reddit.com/r/apple/comments/9qdynm/apple_not_hel... https://discussions.apple.com/thread/252449855
If from Apple, you may consider a chargeback. Or suggest that you'll do a chargeback if they don't refund you when you next check on the status of the replacement.