Fraudulent Charge By Calm App

I started a free trial for the Calm app through the Google Play Store on my Android phone on 16 September, expecting not to be charged unless I continued with a paid subscription after the trial period. However, I was charged on the same date that I signed up for the free trial. After noticing the charge, I tried to cancel the subscription and request a refund through Google Play / Calm support, but my refund request was denied. I kindly request that my case be reviewed again and that the amount charged for what was presented as a free trial be fully refunded, and that my subscription be cancelled so that I do not incur any further charges.