I hear your sentiments, @samanthachenevic.
Let me make it up to you by making sure you can manage your invoices in QuickBooks.
First, there isn't a need to upgrade your subscription to resolve the issue you're getting. I've got the needed fixes to get you back up and running.
To start, let's ensure to turn off the auto-invoice reminders feature on the Account and Settings page. Let me guide you how:
Then, let's use the Audit Log to check if someone has sent the said invoices. To do that:
If these were sent by the System Administration, then we have an ongoing investigation about it (INV-51047). Our product engineers are aware of this and are actively working on a fix.
Meanwhile, I recommend contacting our support team. This way, they can add you to the affected users list and notify you through email once the fix is available. If you have the old Help menu, you can follow the steps given by my peer @ReymondO above.
If not, then the following are the steps to follow:
Also, please check our support hours guide to ensure they can assist you on time.
Once everything's okay, you can begin entering your customer payments to keep your records correct and up-to-date.
Thanks for your patience while working on this. Feel free to comment back if you have more questions about managing your invoices in QuickBooks. I'll be here to help.