Welcome to the Community, @-rgfapac-com.

First off, please know that we don't want you to experience the kind of scenario you've dealt with. I haven't experienced your scenario myself, but you deserved to be heard. We take your complaints very seriously as they help us find better solutions and implement corrective action. No worries, I'll take note of your feedback and relay it to the concerned team so we can enhance your overall QuickBooks experience. 

Allow me to make it up to you and get this sorted out. But before we get started, what bank data are you referring to? Did you mean bank transactions? If yes, I've got steps you can follow so the missing transactions will show in QuickBooks Online (QBO)

To start with, did you happen to receive any error messages? If so, please supply any additional details or screenshots so I can provide you with a suitable fix based on the error message you're receiving. I would also like to know which bank you're using so I can check if we're currently having an ongoing investigation with the bank. Any additional information would be very much appreciated.

In the meantime, let's update your bank account to bring in the transactions in QuickBooks Online. I'll show you how:

1. Go to the Banking menu then select Banking.
2. Select the tile for the bank account then click on Update.
   
   

If the transactions aren't showing, let's proceed to solution 2 which is to check around the Banking menu since downloaded transactions are usually put under either the Categorized or Reviewed tab. 

Let's find the missing transaction by following the steps below:

1. Go to the Banking menu then select Banking.
2. Choose the tile for the account you want to review.
3. Go to the Categorized or Reviewed tab.
4. Be sure to filter the date and transactions.

If the missing transactions still don't show up, I'd recommend manually uploading the transactions into QuickBooks Online. 

On the other hand, if you're not referring to the bank transactions, please let me know in the comments so I can get back to you and provide you with an appropriate answer.

Lastly, here's an article that you can visit to know how to fix online banking errors: What to do if you get a bank error or can't download transactions in QuickBooks Online.

I'll be around in case you need further assistance. Simply leave a comment below, and I'll get back to you. Keep safe.