Hi guys , so i am keep sending invoice to clients as paid but they not paid yet. How can I change that?

It's my priority to help you change your invoice from paid to unpaid, @userrajbirsingh2087.

To get started, let’s look at the Audit Log to verify if someone recorded an invoice payment that caused the status to be paid. For detailed steps, please use this article: Use the audit log in QuickBooks Online.

If none, open the invoice and delete the payment linked to change the status back to unpaid. Let me guide you through the steps.

1. In your QBO account, select Sales from the left menu.
2. Choose Invoices.
3. Locate and open the invoice paid mistakenly.
   
   
4. On the Invoice page, click the 1 payment made link under the Payment Status.
5. Select the date.
   
   
6. In the Receive Payment screen, click More at the bottom.
7. Choose Delete, then select Yes to confirm.
   
   

Once done, the invoice will be marked back as unpaid.

Otherwise, if there's no invoice payment, make sure that the Automatically apply credits option is turned off in your account. This way, your customer's advance payment will not be applied to the current invoices. This feature could be the reason also why invoices are showing as paid since any credit on the same customer will be used to any open invoices.

In addition to that, let me share these articles guide you in managing your invoices in QuickBooks Online: 

• Receive invoice payments.
• Create progress invoices 

Fill me in if you have other questions about handling your invoice transactions in QuickBooks. I'll be sure to get back to you. Have a great weekend!