I Like Seeing People Happy

Hey. Im Lisa. Im 16 years old girl from Israel. I practice martial arts for 12 years and gymnastics 13 years and im modeling 2 years. My height is 1.79 (5'10).
I have a class of 5 men that im teaching martial arts. They started to learn from me after idefeated them in a tournament where i was the only girl, and tge youngest.
We have rules in the class, for example- they must adress me as "Miss lisa" and they must follow everything i say, like if i tell them to do 10 push ups the say "yes miss lisa" and do it.
In the last few days 2 of them dont call me miss lisa. Should i punish them? How???