I need to permanently block somebody from my phone

The article that you linked in explains blocking:

Block phone numbers and contacts on your iPhone, iPad or iPod Touch - Apple Support

Call your cell carrier. They can block a number for you.

Tap the i next to the entry for one of their calls in the call log. Scroll down and tap block contact.

If you’re an AT&T customer, you can also download and enable their Call Protect app. It will automatically flag and block some spam and fraud calls without you havjng to do anything.

No problem. I have dozens, if not hundreds of numbers blocked. Of course, most of them are bogus, I'm sure as the telemarketing / scammer scum often use fraudulent numbers, but it's better than nothing.

KiltedTim wrote:

No problem. I have dozens, if not hundreds of numbers blocked. Of course, most of them are bogus, I'm sure as the telemarketing / scammer scum often use fraudulent numbers, but it's better than nothing.

And there is a certain visceral satisfaction in blocking them.

Thanks for that. I've never had to block someone, so now I know how to advise others.