Can't connect bank. Error 103 We reported this issue since a month. no positive response.

Thanks for bringing this one to our attention, mhaccounts.

I appreciate your effort in reporting the bank error 103 to our phone support agent. I'll personally share your feedback with our Customer Support Team regarding this one. We'll be able to take action on improving our customer service.

May I know what's your bank provider? This way I can check on our end about the update of this banking error. 

The banking error 103 occurs when your user ID or password is incorrect. If you already did all the steps in the Fix banking error 103 in QuickBooks Online article, I'd suggest contacting our Customer Support Team again (with your case or reference number).

I know you already called but since this is a public forum, they can pull up and check your account in a secure environment. They'll also check further on what they can do.

Here's how:

1. Click the Help icon on the top right. 
2. Tap the Contact Us button at the bottom. 
3. Enter a short description of your concern. 
4. Tick Continue. 
5. Choose Message an agent to connect with our support. 

In the meantime, you can manually download your bank transactions in QuickBooks Online (QBO).

I have a link here that provides you with articles about managing your bank account: https://quickbooks.intuit.com/learn-support/banking/misc/02/bank-feeds-global?label=QuickBooks%20Online.

Fill me in if you need a hand with reconciling your accounts or ay QBO related. I'm always here to help. You have a good one.