It sounds like you started a Lightroom subscription using the 7-day free trial offer, and did not cancel before the trial ended. By not cancelling during the trial period, the paid subscription would begin 8 days after starting the trial.
Apple owns the transactions and I believe only Apple Support can refund the subscription. However, contact Adobe Support directly to see what they can do. To contact Adobe Support please visit https://helpx.adobe.com/contact.html, sign in, and then select the chat option.