I removed the beta off my phone but i keep getting the notifications how do i make it stop ?

I'm betting that you did not actually remove the beta software. You probably just removed the beta profile, which is not the same thing.

you can confirm this by checking Settings > General > About and looking at Software Version. it probably says 14.2?

I have heard that the next beta release helped resolve this issue. So you can go 1 of 2 directions. reinstall the beta profile, restart your phone and see if there is an update. Or you can remove the beta software

How to uninstall iOS beta software - Apple Support