Migrated site still holds old URL

I recently migrated a wordpress website that was working fine, from one installation on windows server with IIS to another, different physical machine. Because it was IIS I could not use the tools that MAMP offers.

But despite the command line limitation, the database was migrated across, a new user was added to match the old db user, and I imported the .sql file and the main page now shows up on the new site.

but click ANY item or link and it redirects back to the old site. In the wp-config.php I had forced the URLs, at the bottom had:

define(‘WP_HOME’,’https://aaa.aa.aaa.edu/webbeta’);
define {‘WP_SITEURL’,’https://aaa.aa.aaa.edu/webbeta’);

this was in the OLD site, had done this so that the setting in the admin page could not be arbitrarily changed as there are 7 people accessing it. So the sites showed up in the admin page but greyed out. Now? this seems to have caused a side effect?

How to change the migrated site to use ITS OWN url? I of course modified this in wp-config.php in the new site, it has no effect. it always redirects back to the old site, what can be done? what needs to be changed?