the $5  a month was a teaser rate for 3 months, then the regular rate kicks in

see this

https://quickbooks.intuit.com/self-employed/

Resolution for 'bill increase issue: 'Why did my QuickBooks Self-Employed bill increase in October?' available: Yes.

The bill increase 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 bill increase issue yourself by looking for a resolution described in the article. If it is a complex bill increase issue or you are unable to solve the issue, you may contact us by clicking here or by using other bill increase support options.

For more information about resolving issues related to bill increase in Quickbooks/QBO or to get support for the issue 'Why did my QuickBooks Self-Employed bill increase in October?', click the link below: