You can go about it in a handful of ways!
Firstly, please take a look over at our FAQ-section and see if this is something we may have already addressed.
Secondarily, you can head over to our Support Forums to take a look and see if someone else had already posed a similar query to yours. Posting your question here beyond that often yields positive results as well.
Third, you can head over to our Purchase Support Page to submit a bug relating to a purchase within a game.
Or finally, if these three options don't cover what you are looking to do. You can reach out directly to Support@armorgames.com. Please when doing so detail the game you are experiencing the issue with, and a detailed description of the error in question. Please provide any supplementary screenshots as you are able.
I hope this was able to address your concerns, and if I can help with anything else please let me know.
Kord's strength be with you.