Sorry that this happened to you. However, Southwest's policy on the matter is quite clear -- and not hidden -- if you mix payment methods to pay for a ticket, and one of them has an expiration date, then all funds used to pay for that ticket adopt that expiration date. You may think other airlines are better, but for the most part, they'll take $200 of your money off the top whenever you change or cancel a flight. Southwest doesn't, but as you learned, you have to pay attention to the rules.
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