LinkedIn Premium SGD Annual Renewal After Free Trial: Refund Request

I subscribed to a one‑month free trial of LinkedIn Premium starting on 26 July. Without any prior notification email or clear reminder about the renewal, my subscription was automatically renewed on 26 August for one full year, and an amount of 600 Singapore dollars (around 410 euros) was charged to my account. I only discovered this annual charge today when checking my bank statement. I have not been able to contact LinkedIn support directly so far and therefore I am turning to you through this complaint. In this context, I kindly request the immediate cancellation of my current LinkedIn Premium subscription and a full refund of the 600 SGD (approximately 410 euros) that was charged, as I did not wish to continue with a paid annual subscription and did not receive any information email about this renewal.