How to cancel UTSA application?

I recently found out that I’ve been admitted to my dream school so I wanted to turn down UTSA. I completed an application a while ago and also set up an account but I haven’t paid any fees or uploaded anything besides my one essay. I opted not to pay anything and instead selected to use a waiver, which I have, but you have to combine the waiver with like tax returns or some other things as proof. I totally do not want to do that. Too lazy, I don’t even want them to look at my file anymore. Navigating ASAP is a nightmare. Should I call them directly or just leave my account to rot, change the passphrase to something even I can’t remember then just leave it at that?

You don’t have to do anything else if your not going to attend the school.