A similar thing happened to me but not for a layover. I was just at the airport for 2 days and went back home but on Christmas Day they canceled the entire trip, finishing on Thursday, 12/29 with no rebook. Instead, they gave a refund credit which you can dispute and request a cash refund on the contact me page. Posters on this site suggest calling the international numbers for the airlines as they are answering for domestic flights. Here's more info:
https://www.southwest.com/traveldisruption/
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