How do I return a purchase from the Ubuntu Software Centre?

I purchased Amnesia (game) from the Ubuntu Software Centre. It crashes on startup every time and I therefore want to return it for a refund. I can't find a way of doing so through the USC and, strangely, I can't find any trace of this having been asked before (maybe bad googling on my part). So the question is: how do I return a purchase and get a refund through the USC?

EDIT Installing proprietary driver for AMD catalyst fixed Amnesia, but I still think this is an important question because it's basic customer service for any purchase. I'd therefore appreciate any answers anyone can find and I will continue to look too. If I find the answer I'll post it here.

Solution 1:

From Ubuntu Software Centre Terms of Service clause 3 a :

Payment for apps is due at the time you purchase the app. You will be asked to enter your credit card number and we will charge your credit card at the time of purchase. Fees are charged in the currency in which you make your purchase. All fees are non-refundable.

Solution 2:

Here's a link to the official FAQ about purchases and refund, which means you can get a refund. You just have to write an email to [email protected] with the purchase receipt.