(US) What happened here? Unauthorized charge immediately credited back

This morning I noted a $339 debit card charge that neither my spouse nor I recognized from Starlink. But we also had a $339 credit from Starlink on the same day (no timestamp, I’m assuming the purchase was first). We have never used Starlink. The charge was made without a PIN in California, we live on the East Coast.

I called my bank and they said “that’s weird” and cancelled the debit card and are sending me a new one. I’ve heard of scammers trying to sneak small amounts through to see if a card number is valid. But this amount is noticeable and refunding it is just weird. Ultimately, no money was lost, but I am curious what happened.

Thoughts?