Tracfone Failure to honor refund Internet

I purchased a Tracfone "bundle" from Walmart.com on 9/8/12 to be given as a gift to a traveler.
I also purchased, again from Walmart.com, a 60-minute airtime "card" to be delivered via email to be placed on the phone once delivered.  The travel plans were canceled the same day, so I determined that the physical phone would be returned to a Walmart store for refund once it was delivered, but the airtime card I was told had to be refunded by Tracfone.  I called their toll-free number and, after being told by a rep that no refunds were issued on airtime cards, I asked to speak to a manager.  A manager named "Nicolette" repeated the policy of no refunds (never shown anywhere in the sales information when purchasing this item), but after verifying the email delivery method and the unused PIN number of the card, told me that once the phone was returned to Walmart I could call her back and that--"as a one-time courtesy"--a refund would be issued for the unused email card.  She gave me a "reference number" to be used when I called back. 

The phone was returned to Walmart on 9/17 for a refund, but when I called back to Tracfone I was told that no refund would be issued for the unused email card.  I repeated what I was told by "Nicolette" and gave the "reference number" I was given--and verified twice before hanging up my call with Nicolette--only to be told that the "reference number" had no relevence, since it was nine digits instead of ten.  I then spoke with a senior manager named "Colette" who verified that the PIN number of the email card indicated that it was, in fact, unused and not downloaded, but that there would be no refund issued to me, despite the previous statements from manager "Nicolette".

Beware this outfit.  They want to keep my $20 and deliver no service in return, despite their promises of "service".