Has anyone had problems with invoices sending and no support from quickbooks ?

You can switch to another accounting app and buy a 3rd party conversion service if required.

Thank you for posting here on the Community page, mehlogisticsltd. 

A possible browser issue might have caused the error when sending the invoice. I'll share some steps with you that can resolve some of the most common errors and browser issues in QuickBooks Online.

Let's start by accessing QuickBooks (QBO) accounts using a private browser. The following are the shortcut keys you can use:

• Google Chrome: press Ctrl + Shift + N 
• Mozilla Firefox and Microsoft Edge: press Ctrl + Shift + P
• Safari: press Command + Shift + N

Once done, try to send the invoice again.  If it works, you can clear the cache and cookies of your browser. If not, you can use another supported browser. Possible that your current browser may have a temporary issue with QuickBooks.

I would also like to share another set of articles for additional references:

• Record Invoice Payments in QuickBooks Online 
• How to Set Up QuickBooks Payments 

The Community will always have your back if you need a hand in sending invoices or any QBO related. We are always here to ensure your success. Take care always.