Marshmallow update keeps downloading, even after telling it not to repeatedly

My VZ Note 4 keeps downloading marshmallow update at 9:40pm pst, even after I told it not to in system update settings multiple times. First I could stop it by turning off wifi. That worked for several days, but now it resumes download over cellular. When I click on system updates, it says "Download interrupted. Software download will resume automatically."

I've repeatedly rebooted and pulled battery trying to convince it to cancel, but it just resumes.

Any thoughts or suggestions would be massively appreciated.