Thanks for letting us know about your banking concerns with M&T, @Laura VAR.

Please know that QuickBooks Only depends on what your bank sends into our system. 

Since manually updating your bank account in QuickBooks Online (QBO) didn't work for you, I suggest contacting our Customer Care team to help you take a closer look and identify its cause and come up with a permanent solution. 

Here's how:

1. Go to the Help menu at the upper right, then select Contact Us.
2. Enter your concern as M&T Bank not updating.
3. Click Let’s talk.
4. Select the Get a callback option.
5. Enter your contact info.

For future reference, check out this link to help you learn more about finding missing transactions downloaded from your online bank and credit card accounts.

We're always around to listen and help in managing your bank transactions in QuickBooks, Take Care!