You can cancel your free trial at any time.
If you subscribed with the App Store:
Go to the settings of your iPhone
Tap on your profile account (profile picture in top right corner)
Go to Subscriptions
Go to Kotcha
Cancel subscription
If you subscribed with the Play Store:
Go to subscriptions in Google Play.
Select Kotcha.
Tap Cancel subscription.
Follow the instructions.
If you subscribed with Stripe (Web):
Go to Stripe website.
Enter the email of your Kotcha account (available in the "Me" tab > "Account" menu).
Open the link in the confirmation email you will receive.
Manage your subscription.
Your subscription will cancel at the end of the trial period. It will not renew.