Hello,
I understand that you would like to have a refund from Google Play. I did look at our documentation and I hope this resolves your issue. I know this must be frustrating but I will do my best to assist you.
You may get a refund for certain Google Play purchases but it also depends on the policy. I understand that you may contact the developer directly. You may get a refund if the product was purchased accidentally. I believe this is what you are after.
There is a document[1], which goes into more detail and I hope this helps.
[1] https://support.google.com/googleplay/answer/2479637?hl=en