QB Issue Resolution:

It sounds like you had the introductory rate (usually for 3  months) an it just went up to the regular rate.  To be sure, you’d have to contact Intuit tomorrow.

https://help.quickbooks.intuit.com/en_US/kb/how-to-contact-quickbooks-self-employed-support%3F/p_na_…

Resolution for Issue 'Why did my QuickBooks SE Online Account Fee increase from $5 monthly to $10 monthly?' available: Yes (Solved).
Source: Intuit Community forum.

Why did my QuickBooks SE Online Account Fee increase from $5 monthly to $10 monthly?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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