I have three $50 LUV vouchers expiring on March 21. As SW restricts you to three purchase methods including a credit card for the $5 taxes/fees, I do not believe I am am able to utilize the credits in time. Can I purchase a +100 ticket before that date, cancel it and have the credits available in my account for use beyond the 21st?

Secondly, is there any way to use more than three payment methods on a purchase? I have a total of six LUV vouchers (others expire in July) and a $75 credit on my SW Priority card that I would like to use. I don't mind buying a few tickets and canceling like above if necessary. Is something like that that possible over the phone?