Cancel Hint Subscription & Refund

I am writing to report an unauthorized charge of 29,99 € related to HINTAPP.COM/US that has appeared on my bank card, issued in Spain. I have no knowledge of having contracted any Hintapp product or subscription that justifies this payment, and at no time was I informed that such an amount would be charged to my card. The charge of 29,99 € appeared through Google Play / apps and is linked to Hintapp, but I do not recognize any purchase, subscription or service that would authorize this transaction. I feel that this payment has been made without clear consent and without transparent information about the concept and conditions of the supposed service. I request that the 29,99 € be refunded to my card as soon as possible and that any subscription or recurring payment associated with my data be completely cancelled so that no further charges are made in the future. I also ask that you inform me in detail of what product or service this charge corresponds to and how you obtained my card details. I expect a prompt response and a clear solution, with the corresponding refund and written confirmation that any subscription or automatic charge related to Hintapp or HINTAPP.COM/US has been permanently cancelled.