Only subscription made through Meeting.ai from Apple App Store is managed by Apple. If you subscribe from Android or Web App, please refer these articles:
Uninstalling your app will not cancel the subscription.
Step to cancel from Meeting.ai app
Open the Meeting.ai app
Open "Profile" page from navigation bar
Click "Manage Subscription". This button only appears when you are subscribed.
You will be redirected to iOS Subscription Settings
Click Cancel subscription button and confirm your decision
Step to cancel from iOS Settings
Open "Settings" app on your iPhone
Tap your name at the top of the screen to open your Apple ID profile
Select Subscriptions to view all your current subscriptions
Scroll through the list and tap on Meeting.ai subscription
Choose Cancel Subscription and confirm your decision
Please refer to Apple official guide for more details