I keep getting various errors when trying to use both the app & website. They are in both the bank transactions (app) and expense / receipt processing. Who to speak to?

Thanks for updating us here today, @userjames2. I understand that we need to fix this issue right away. 

This problem occurs intermittently which is why it worked, and sometimes not. It's good to know that you have contacted our Customer Care team. You will then receive a notification via email about its progress. So keep posted. 

For future reference, check out this article to see details on how you can classify expenses and bills into the right account depends on the situation: Capture and categorise expense receipts and bills in QuickBooks Online.

I'm always around here to help if you need more assistance. Have a great day ahead.