Understanding Refunds for Voided Invoices

I am trying to work out a solution to an issue I am facing with voided invoices. I have a moving service that my customers pay for and the prices varies based on the options. Sometimes we get the price wrong and the options wrong so I have been voiding the original invoice and issuing a new one with the correct information so that the. customer always has an accurate invoice. Then I take the unapplied payment from the original invoice and apply it to the new one. Then I issue a refund (through Merchant services) and a refund receipt through Quickbooks Online. The problem is that when I do this, it leaves the customer with a negative balance in my books? What is the right way to handle this?

For example, this customer account below shows an open balance of -$160.00.