Also, the vendors account is showing an double the credit now after entering the bill credit as directed in the instructions..
You're already on the right track, @BKdk78. I've come to further guide you for recording the refund check to clear out your vendor's credit in QuickBooks Desktop (QBDT)
Before we start, I commend you for following the first two sets of instructions to record the refund check you've received from your vendor.
You may have used an expense account when recording a deposit of the vendor check that's why the deposit didn't show up on the Pay Bills page. Then, the vendor's account shows double credit after entering the Bill Credit since it isn't yet linked to the deposit. With that being said, you'll have to change the Received from Vendor Account info to Accounts Payable (A/P). This way, you can proceed in linking the deposit to the bill credit and record the refund accordingly.
You'll first have to locate the deposit by pulling up the Deposit Detail report and update the account from there. Here's how:
- Go to the Reports menu.
- Select Banking, then choose Deposit Detail.
- Set the appropriate date in the Dates field.
- Locate the deposit and double-click it to pull up its details.

- Change the expense account to Accounts Payable (A/P) under the From Account column.
- Click Save & Close.

Once done, go ahead and link the Deposit to the Bill Credit through the Pay Bills window. Follow the third and last set of instructions above. This time, I assure you the deposit will show up. (Please see the sample screenshot below for your reference.)

To know more about recording refunds you received from a vendor, you can refer to this article: Record a vendor refund in QuickBooks Desktop.
Also, QBDT offers a wide variety of ready-made vendor reports that tell you where your company stands, in terms of expenses and accounts payable. If you wish to know more about them, I encourage you to check out this article: Customize vendor reports.
Keep me posted on how it goes. If you have other concerns about managing vendor transactions in QBDT, please feel free to comment below. I'll gladly help. Take care always.