I was charged Monthly payment even though it was a free month of trail. Please advise

Hi natalia-nataliab,

Thanks for reaching out here.  Welcome!  It's important that you have a complete understanding of your QuickBooks Online account.  As Fiat Lux has mentioned, your selection to 'buy now' rather than choosing the trial version would be a reasonable factor.  However, you can contact us so we can take a look into this from our end, and determine a positive outcome with your QuickBooks Online subscription.

Schedule a Callback or start a Chat: click (?) Help in the upper right in QuickBooks Online > enter "Contact support" > hit Contact Us > provide a brief summary of your situation > hit Let's Talk > choose Get a callback or Start a Chat.
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You can also check the Get help with QuickBooks products and services article for the support hours.

Feel free to reach back out with other questions or concerns.  We'd be happy to help!