I was offered a voucher recently when Southwest made a mistake. When they were offering me various different choices of compensation, they didn't mention anything about the voucher expiring within a year. It was only later, when I actually received the voucher, that I found out about that limitation. I have heard some airlines mention "good for travel within a year" limitations when asking for volunteers to give up their seats, but I didn't hear anything like that this time. OP didn't mention what the horrible experience was, but Southwest doesn't give out $1400 in vouchers very easily. It sounds like the experience must have been unusually bad, or affected a whole group of people. If OP is still around, I would certainly contact customer service and explain why you couldn't travel. Imposing conditions after the fact doesn't seem fair. That's especially true if they were offering you the vouchers in lieu of something else such as a refund or reimbursement for expenses.
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