What you'll have to do will be to set a reminder on your phone for 27 days from the moment you've activated the free trial link and gave the platform your banking info.
You can follow them for free and enjoy the content accordingly.
As a creator we all think to promote our account so we can grab fans in future, sometimes people get addicted to your content, and then you can charge them by selling subscriptions.
But here is to get free or discount on subscription.
Letters may be edited and shortened for space.
But if you do nothing and the offer free trial expires, there's nothing you can do.