QB Issue Resolution:

Well, as you know with things on the internet, they are never completely deleted.  To cancel/unsubscribe, go to gear>billing and subscriptions and cancel.

Resolution for Issue 'How does one completely delete/deactivate a Quickbooks Online account?' available: Yes (Solved).
Source: Intuit Community forum.

How does one completely delete/deactivate a Quickbooks Online account?: 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.

Support for billing and subscriptions
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Error Recovery for billing and subscriptions [Canada]
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