SparkChat subscriptions are managed directly through your device's app store.
To cancel your SparkChat subscription on iPhone or iPad, follow these steps:
Open Settings > tap your name at the top > Subscriptions > tap SparkChat > Cancel Subscription.
Apple support: How to cancel a subscriptionTo cancel your SparkChat subscription on Android, follow these steps:
Open the Google Play app > tap your profile icon > Payments & subscriptions > Subscriptions > tap SparkChat > Cancel subscription.
Google support: Cancel a subscription