Rates for Grammarly Pro subscriptions are indicated per member. Additional seats for inviting more members to a Grammarly Pro plan come at an extra cost according to the selected subscription. The charge amount is prorated based on the remaining days in the current subscription period.
If you accidentally invited additional members, remove them from your plan on the Members page and contact Support for further assistance.
Note: Currently, Grammarly does not issue automatic refunds when a member is removed from a team plan.