Urgent: Paid $340 for webinar increase to 1000 but still getting getting 500 attendees

I need urgent support. I want to set up a webinar soonest. I have paid webinar upgrade from 500 - 1,000 attendees of $340 but not able to add participants to 1000. when i am setting the meetin. 

How do i gett my attendees to 1000 of what i have paid for.

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