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I got your back in ensuring that you'll be able to delete the credit after customer issued a refund in QuickBooks Online.
Here's how to delete or void credit:
I've added some resources below to give you more insights about handling customer refunds in QuickBooks:
If you need additional assistance in performing the process, you can always reach out to our Customer Care Team. They can run a remote-viewing session and walk you through the steps.
You're always in good hands here in the Community. If you need more help with your customer credit please don't hesitate to reach out to me again. Wishing you a great day. Stay safe!