I did a transfer from my quickbooks checking account to my personal to pay bills, and the transfers haven't arrived... 15 days later.

Hello, Mana.

For cases like this, please contact our QuickBooks Payments Team directly. They can securely access your account and provide the status of your payment. You can reach them directly through your QuickBooks Online (QBO) dashboard.

You can follow the steps below:

1. Sign it to your QuickBooks Online (QBO) company using any supported browser.
2. Select (?) Help is in the upper right corner of your screen.
3. Type a question or topic you need help with, then select Contact a human.

You can refer to this page to find out the availability of our live experts at your convenience: Support Hours.

I'll share this article that addresses common questions about how QuickBooks Payments deposits function in QuickBooks Online: FAQS. 
 
Feel free to reply to this post if you need further assistance.