Not receiving text from someone

[louk]

What do you think would be the problem/how to resolve not receiving text messages from one number?? I receive text messages from everybody apart from my dad and this only started 2 weeks ago. I have checked i havent accidentally blocked him so its not that. Nothing wrong with dads phone either, other people are getting his messages. 

[Kimmy2]

Hey. Have you tried deleting the contact and re adding?

[Mitzzz999]

Have you contacted your network about this? Might be worth getting a SIM swap done if you have deleted and readded your Dad as a contact.

Sounds like his message centre number is fine too.