QB Issue Resolution:

The only “transactions” that can possibly disappear are the initial bank feed that are NOT in your books but are all pending For Review. They do disappear when you disconnect. You can reconnect the same account and up to 90 days of items should import. If that does not work you can manually import bank transactions

Resolution for Issue 'I canceled a bank canceled a bank account to save money on fees but now all my transaction form that account is gone is there any way of getting that information back' available: Yes (Solved).
Source: Intuit Community forum.

I canceled a bank canceled a bank account to save money on fees but now all my transaction form that account is gone is there any way of getting that information back: 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 Bank Feed
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Error Recovery for Bank Feed [Canada]
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