You've come to the right place, useramoselouise. I've got the steps you'll need on correcting the product on your invoices.
Please follow the steps I've outline below:
These steps are sure to help you get the right product to your invoices.
For future reference, you can check out these links about recording invoice payments as well as changing product/service items in QBO:
I'm just a post away if you have any additional concerns about managing invoices in your account. Take care!