If you have a problem with a Dejal app, please get in touch to get help solving it. I'd rather you were a happy customer!
If it can't be solved, and you purchased directly from Dejal, you can use that contact form to ask for a refund. I want you to be satisfied, so I offer a 60-day money-back guarantee on all direct purchases.
For Mac App Store or iOS App Store purchases, unfortunately I can't offer a refund, as you purchased from Apple, not Dejal. They have their own mechanism for refunds; see the Report a Problem page to get started.
Similarly, for purchases via third-party promotions, localizers, or other resellers, you need to contact the seller to ask about their refund policy.