Straighttalk Ripoff Unreachable paid $48.23 only to have my card credited to another phone number Nationwide

I bought a $45 Straighttalk phone card at Walmart in Albuquerque, NM on 9/2/2015. I called Customer Service and entered the PIN from the card. Right at the end of the call, I was told that this card would be credited to ANOTHER number! I have not been able to reach anyone from this company at all. All their phone numbers go to an automated menu system with no "Speak to a human" choice. I tried taking the card back to Walmart with the receipt and they would do nothing about it. They kept saying "It says right here on the card No Refunds". I said "I don't want a refund, I want to exchange it for another card". They would not budge even though there was a sign right there that said "Satisfaction Guaranteed through refund, exchange, or store credit". I told them that their sign was a big fat lie, to which they said "I'm sorry sir but we can't do anything about it".

The combination of Straighttalk and Walmart is a giant ripoff machine! My wife was in the hospital in Intensive Care and has since passed away. What a bunch of cold hearted people! I still have the receipt and the card. I paid for it with my debit card, too. What can be done about this?