I have added a refund receipt for a partial payment from a customer. It adjusted my QB balance, but it did NOT adjust the customer balance. How can i fix that?

I can help you adjust your customer balance, @tom122.

You'll only use a refund receipt for closed sales. Refund receipts won't affect the customer balance, it only affects the income and bank accounts. You can delete the refund receipt transaction and create an expense or write a check to correct this. Here's how:

1. Go to Sales, then Customers.
2. Select the customer's name, then Transaction List.
3. Tick the Filter drop-down, change the Type to All transactions, and Date to All dates.
4. Locate the refund transaction and click to open. 
5.  Click More towards the bottom, then Delete.
6. Hit Yes, when prompted.

Once done, go to +New, and then Expense or Check using the A/R account to correct your customer balance.

I've added this article about customer refund at this link here: Record a customer refund in QuickBooks Online. We also have a guide on how to handle customer credit or over payment that I'm sure you'll find helpful. It has steps that'll guide you through the process.

Please know that we're always here if you have other questions or concerns. We're here to lend a hand. Thanks for reaching out to us today and I wish you have a great weekend ahead.