Not receiving calls from a few people

Greetings BuddyGolly,

Check if the contacts are blocked, which may be why the calls aren't arriving. To do so, tap Settings > Phone > Blocked Contacts. Check out that suggestion, and further troubleshooting steps, in the following article: If you can't make or receive calls on your iPhone - Apple Support

Check your iPhone settings

1. Turn Airplane Mode on and off. Go to Settings and turn on Airplane Mode, wait five seconds, then turn it off.

2. Check Do Not Disturb. Go to Settings > Focus > Do Not Disturb and make sure it's off. Learn how to use Focus on your iPhone or iPad.

3. Check for any blocked phone numbers. Go to Settings > Phone > Blocked Contacts.

4. Check Call Forwarding. Go to Settings > Phone > Call Forwarding and make sure it's off.

5. Check Silence Unknown Callers. Go to Settings > Phone > Silence Unknown Callers. If the setting is on, a caller must be listed in your Contacts or Recents. Or they must have shared their number in Mail or sent you a message using that number in order for their call to go through. Add their number to Contacts to ensure the phone rings. Calls from some third-party apps might not go through.

Kind regards.

BuddyGolly,

As the steps there hadn't helped, you may try contacting Apple Support again, which may require working with a Senior Advisor for a further investigation.

This link can help start the support request to reach back out: Apple Support

Cheers.