To better help you, please go to the 'My Page' and select 'Help center'
Then submit a request explaining why you would like a refund, and attach an image of your Google Play receipt and press send.
Then, we can give you better feedback.
*To find your receipt : https://support.google.com/store/answer/6160235
Please be advised that if you have already spent your Diamonds, we will not be able to give you a refund.