What's email address of Airtable support team?

I downgraded to a free plan yesterday but a few hours later I still got charged for the new month. Need support team help but can not find the support team email address? From the FAQ articles, it guides to click “help” then “contact support”, but while I do this I only see a robot chat pops up.
How can I get the refund?

its support@airtable.com

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