If your SIM card definitely has the latest phone number on it, can you try completely signing out of your Samsung Account, and then signing back into it? That sign out/sign in should reset the Profile Sharing setting - but let us know how it goes.
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I am using Samsung A6. I also have the same issues. I insert two SIMs to my new A6 phone, one SIM uses for calls and another SIM uses only for data. In my profile the data SIM number, appear as a registered number. I edit the profile by retype my correct number. But if I turn off the phone and restart, the old number appearing again.
It's really disappointing to still be waiting for a response from Samsung isn't it.
Why can't they just amend the website to unregister a number, and take into account instances where you no longer have the number (e.g. by porting a number in....). Surely this would be an easy fix to just remove the number from an IMEI.
Come on Samsung! https://www.samsung.com/au/support/unregister-profile-sharing/