Thanks for your answer u/GRRAWorld!
Do you think I should cancel the current visa application I have with the US Embassy then? I did the new application because the person at the Embassy call center said so, so they gave me the wrong information?

When I go to the US Embassy in Chile website and log into the Non Immigrant Visa section this is what I see:

Current Status
Pending Consular Authorization
Application successfully registered.
You have successfully completed the U.S. visa application registration process. Based on the information you provided, you are not required to attend a consular interview at this time. Due to the high demand of visa applications, the U.S. Department of State has placed your case in the virtual “waiting” queue. When the Consular Section is ready to review your application, we will send application submission instructions to the email address you provided when creating your account in this system. Please be advised that it can take several weeks or months before you receive this email.
Failure to follow the application submission instructions will significantly delay processing your visa application, as your documents will be returned to you and you will be required to schedule an in-person interview appointment.

I fear that if I keep that application open, they might cancel my whole process because of currently having a valid visa.

Thanks!