I purchased a product (software addon of sorts) that doesn't work and the creator is not interested in offering support (doesn't respond to messages, and I am not the only one who got essentially scammed by them). I am hoping to have the purchase refunded, since for all purposes, the addon doesn't work. I already sent an email regarding the refund request a few days ago, but I got not response. 

Please, help. Thank you!

Sorry to hear that, but the rules of this category that expressly say not to ask this question exist for a reason. It depends. Support has to prioritize issues. And a few days ago it was the weekend. Please wait.