Can anyone help me please I have applied a payment received ( and deposited into the bank account t ) to the wrong invoice how do I reverse this

Hello there, @jennybuhk-bigpon.

In QuickBooks Online, you'll have to delete the payment associated with the wrong invoice to get this done. With that, we'll have to open the invoice where the payment is applied. Here's how:
 

1. Go to the Sales menu. 
2. In the Customer tab, select the customer name.
3. Under the Transaction List, find the payment you want to correct.
   
4. Click More. Then, Delete.
5. Once done, Yes to confirm.
   

Afterward, record a payment to the correct invoice. When utilizing the Receive Payment feature, make sure to tick the correct invoice (don't tick the other invoices if it's not included in the payment). Then, make sure to deposit it to the correct bank account. Also, review or double-check the amount. 
 

Here's a sample screenshot:

I've collected some articles for additional information about handling customer transactions:

• Record a customer refund.
• Group multiple payments together into a single deposit.

Please let me know how it goes. I'll be around to help if you need further assistance.  Stay safe, jennybuhk-bigpon.