It seems you’ve already used the free trial for PLINK before, so your subscription was charged automatically this time. This is a standard procedure which follows Apple/Google’s payment rules.
We don’t have access to your payment details or purchase history, as all payments are handled directly by Apple/Google. The free trial is only available once per Apple/Google account, and creating a new account doesn’t reset this.
To request a refund, please follow the instructions in this article.