A lot of my heroes don’t get the C badge or and don’t earn mastery points when I battle. They have the stars needed and show on the mastery list
Do you battle in City Watch/Surge/Invasion? Do they have three stars?
Or maybe you’ve already mastered them? 
A common problem is that they won’t show the C if they have 0 points so far. Like if Jasmine is at 0/30 in the princess collection, she won’t have a C on her.
I battle on creep surge, city watch and invasión using all heroes every day and they still don’t get the ponts
The heroes have the stars required
I’m not raiding
Okay… I’m afraid I don’t know how to help you then…