The right way to add trial (free) days for active stores

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Could somebody give me advice on the next situation with the Shopify application billing?
RecurringApplicationCharge was created for the application and the billing period started (no trial days left). Later new RecurringApplicationCharge was created with additional trial days (14 days), of course, previous RAC was canceled. After that, the store owner got an invoice (1-month payment), cause the billing cycle started earlier than the new RecurringApplicationCharge was accepted. Does Shopify handle this case? What will happen with unused money (14 days), can they be transferred to the next billing period?
Is it the correct way to add additional trial (free) days for the store which has active RecurringApplicationCharge? Maybe another (better) way exists?