I need an email or phone number for customer support please. This is nothing to do with me using the app rather I have a complaint.

I appreciate you for posting your concern, Therem.

Direct email for customer support is unavailable for security purposes. There's a phone number you can reach out to by visiting the contact support website. I'll assist you with any concerns you have. If this isn't about the app, Can you please provide more details about it? You can post any of your concerns here on the Community page.

Any additional information about your concerns is greatly appreciated so we can provide you with appropriate fixes. Please note to mask any personal identifiable information.

You can also check this article link to learn more about QuickBooks Online functionality: Frequently Asked Questions.

Please let us know if you have questions regarding contact support details and QuickBooks concerns. I'm always available to assist you. Take care.

@theremedy0116-gm   Just FYI, They don't care about anyone's complaints.  You can talk to 20 different employees on any given day and nothing will change and no one will care.  
You can post here about your complaints, and same thing.  The only difference in posting complaints here in the community is that you will find others that actually feel the same way.  

Good luck.