SIM popup messages keep the screen on indefinitely (Samsung A30s)

A little background: In my country, carriers keep sending those annoying pop-up messages (I think they’re called class-0 messages?). This has been the case for a couple of years and they won’t stop no matter what you do. Anyway, it wasn’t a big deal with my previous phones; I just learned to ignore them.

However, with my A30s (which I’ve had for a few months), I’m facing a critical issue where the screen will turn on for the message and never turn off unless I close the pop-up or manually turn it off by pressing the power button. There are basically two types of those messages:

1. Ones that show up after a call is ended (very annoying but avoidable if I remember to close the message after ending the call):

   

2. Ones that show up randomly (sometimes at night while I’m asleep. Screen stays on overnight and drains the battery):

   

I couldn’t even tell which app is responsible for displaying those messages. Here’s what I’ve tried:

• Checked the permissions for the Messages app and the Phone app to see if there’s something that controls this.

• Disabled the "draw over other apps" permission for the Messages app.

• Installed Google’s Messages app and set it as default (since I can’t uninstall or disable the main one).

• I also checked the permissions for the "SIM toolkit" app but there were none. I tried disabling the notifications but the option was grayed out.

None of the above helped.

Does anyone know how to get rid of these messages?

Note: I want to avoid rooting the device or installing a custom rom.

I tried reporting this to Samsung but they weren’t very helpful.