If you're having issues with making a purchase or didn't receive your in-app purchase, please find here the following steps to troubleshoot this - Issue Receiving Purchase.
If the issue continues, please contact us first so we can review the purchase and help resolve the problem as quickly as possible. You can reach us via in-game Customer Support chat or by email pm_support@productmadness.com
If you would like to learn how to request a refund directly from Google, visit the following Google's Request a refund on Google Play help article