LinkedIn Premium Scam, Unwarranted Charge After Free Trial

I had initially availed a 1-month free Premium subscription on LinkedIn. To my surprise, upon the completion of this trial period, an unauthorized deduction of 679.99 TL occurred from my account, with no prior notification about the impending charge or the option to cancel the membership. As soon as I became aware of this deduction, I took immediate action and canceled my subscription. Considering the lack of transparency and notification, I am now urgently seeking a refund of the deducted amount. I appreciate your prompt attention to this matter.