Generally refunds are a bit tricky, so it's best if you are really certain you want an item before purchasing it through the game!
In this case you will need to ask Apple directly for a refund on your purchase! Don’t worry it’s not as scary and complicated as it sounds! :) You can find all the information you need on their dedicated SUPPORT PAGE
When making a purchase through the app store you forfeit your right to refund which is stated during the purchase process. Please make sure to always read all policies and Terms of Service
before making a purchase.
Please note that Vivid Games is not obliged to refund purchases made through the app and may provide such service only in rare and signifiant cases at its own discretion.