You appear to have a fundamental misunderstanding of how versions and releases of Enterprise Linux work, as mentioned by @jlehtone. This is easily remedied by understanding that while you may have installed the release 9.3, you are running version 9 and will continue to do so until you replace it.
While keeping your systems which are running EL9 up-to-date, as you should, you will notice that tools and files which report release versions will increment minor versions as all the installed packages which constitute your installed platform, including the “release” package(s) which contains this detail, are updated.
$ rpm -ql $( rpm -qf /etc/os-release )
Now that you understand, you should be able to explain to your customers how you, as a responsible provider, keep your installed EL9 platforms stable and secure with regular (and occasionally irregular) updates (with a suitable acceptance testing, QA, etc. process).