How to contact with live agent

I have encountered some serious issues. May i know how can i contact with live agent?

Community Super Champion | Customer

Welcome to the Zoom Community, @KL05.

See the various support options available to you here, dependent on your type of account:

Newcomer

I need to upgrade attendees from 100 to 300 but I bought it on Apple...anyway to upgrade when apple doesnt allow it

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