Walmart Money Card RIP OFF prepaid cards said failed verification on a prepaid card? then took the money said will mail refund Modesto, California

I purchased a walmart prepaid money card on April 30th 2012. I do this often for my sons online game. However he went to activate the card and was told it did not pass verification process. They then said they would refund the amount put on the card via check through the mail.  A month almost later and the money still has not arrived. When I called customer service, I could not understand the Customer Service Rep nor the supervisor they transfer me to (language barrier). They stated they forgot to add the apt. number so the check was returned. This will now take another 2 weeks to send the refund he added.  I asked if I could go to the store where I purchased it and get refund they declined. I would never purchase another card from Walmart or its affiliates!