refund on accidental license

Hi there, I purchased a license for a Premium Photo by accident which was more than 1 plan credit. I was just in automatic mode for licensing an image, and just clicked through the purchasing without realising it was a significant amount more credits. I noticed right when I clicked "purchase"  but before i could even cancel, it completed the purchase. Can I get the credits refunded to me at all? I have not used the image.