Alex - LicenseCart

You can't cancel it yet leave it active. The customer would have to be charged $9.90/m or you'd have to cancel it and have the customer setup a new subscription when the time is due for the correct amount.
If Blesta implemented billing agreements, this wouldn't be a problem: 
https://requests.blesta.com/topic/paypal-billing-agreements

The module isn't that feature-rich and likely wouldn't cover your needs here. What you can do is look to add a feature request (http://requests.blesta.com) or consider custom development (https://www.blesta.com/development/).