Exension deleted before I could install | Refund?

I purchased the Stamps.com Integration extension. Today when I went to look at the documentation to install it, it seems the extension is gone and no longer available on opencart. How do I go about getting my $50 that I paid for a now useless extension back?

Contact the OpenCart team (by replying to the order e-mail, or using the Support > Contact Us link above) and explain the situation. They should be able to assist.