SW people told me I needed to drive to the airport to purchase my fairs at the ticket counter. I could not use them on the internet. I suggested taking the voucher to our local
travel agent, they said no to that as well. When we took the bump I was told they would treat my voucher as cash, not to lose it since they had no way of telling whose or how much the voucher was for. I just figured we could book our next flight with it.
As long as I get my credit I will be happy. They need to change their system, instead of paper vouchers they could do travel credits which you could then access through SW site.
I also posted on the transportation board. Someone there state they mailed their voucher with receipt when travel was complete. I am hoping to find out something when we go to Orlando or when we return home.