Plans, limits and billing
Leads and capture forms are counted live; events reset on the 1st of each month (UTC). At the lead limit, new leads are not accepted (the form tells the visitor to try later and you get an email). At the event limit, further events are dropped until the next month or an upgrade. You are never charged overage.
Cancel any time from Billing; you keep paid limits until the period ends, then move to Free. Nothing is deleted.