What to do if I purchased a ticket from an airlines and I had to cancel the trip because of weather conditions?

Question Details: They gave me a voucher. I have tried to redeem it but they said it expired 2 days ago. On my account there was nothing written about an expiration date. There was only my credit (and it's still there). They did not send me an e-mail with the voucher conditions. They said they told me on the phone but I have no proof of it. What Can I do?

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