If you are facing difficulty in using or observing an issue, then please report to us with details so we can provide support. Our global delivery team of engineers is working 24 x 7 in 3 continents to make the app relevant and bug-free.
However, if you still feel to go for a refund you may please refer to Google's guide available here.
In case you opened this accidentally but want to know a similar answer for iOS, here is the article.