Apple Gift Card number has 14 digits instead of 16

I tried to redeem an Apple Gift Card I've recently purchased from Walmart and find out that there's only 14 digit pin codes instead of 16 digit. I took it back to Walmart and customer service said they can't refund my money and told me to call apple. I never had any problem with an Apple gift card before and this is my first time. I haven't contact Apple Support yet, I want to ask you guys first if anyone ever had this problem with Apple gift card before. Please let me know and Thank You

[Re-Titled by Moderator]