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I'd like to help you link the payment to the correct bill, geolen.
If you've recorded the bill payment from the + New section, then you can un-link the transaction by following these steps:
Please see the sample screenshot below:
On the other hand, check out this article on how to remove the payment: Pay bills in Online Bill Pay.
I'm just a post away if you have more questions about QuickBooks Online bills and payments. Thanks.