In app item purchase interrupted, double charged.

I bought some in game gems for Skylanders, right as I hit submit, I got disconnected. I got back in and didn't have any items show up so I went through the process again and this time it worked. The next morning I found 2 seperate order confirmation e-mails and a check of my bank account shows 2 charges but I only ever received one of the batches of gems. I tried going through the website to contact customer support billing, but it kept redirecting me back to the website. How do I get the itmes I paid for but never received?