If you have subscribed to SplashLearn trial subscription and want to cancel before the trial ends, please follow the instructions in Apple's website - https://support.apple.com/en-in/HT202039
Turn off the auto-renewal before the trial period gets over to avoid any charges.
If your trial period is over and your card has been charged. Please note, we are unable to process refunds on charges made through the Apple Store from our end. Only Apple can process them. Kindly write to Apple about refunding your purchase through the ‘Request a refund’ option available on this page- https://support.apple.com/en-in/HT202039
You can also get in touch with Apple iTunes support helpline directly at 1-800-275-2273 (US Helpline)