Thanks for reaching out to us in regards to this matter.
It sounds like you have some bad debt, there are a few ways to approach this depending on the accounting method you are using.
Accounting methods used in QuickBooks Online are either on a Cash or Accrual basis, if you're not sure which one you use then it might be a good idea to speak with your accountant to find out.
Use the steps outlined in the following article here to give you some guidance on how to deal with this bad debt.
Feel free to reply back here if you still needed some assistance.
Kristian.
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