Hello there, @quinnt01.
I appreciate you letting us know what happened to your Bill.com account. I can make sure you have the best support to help resolve the deposit amount on your account.
To verify the reason why the ACH transfer failed and the check was voided, I recommend getting in touch with your 3rd party. They have all the tools needed to check your account and give you recommendations in fixing the transaction.
Let me know if you need help with QuickBooks, and I'll jump right back. Wishing you and your business continued success.