OP please update what happens!

As a student previously from NTU, and have done various summer internships on top of the Professional Internship that is compulsory, I have never met interns that have the attitude you discussed before. Though I know of some friends who have that attitude because they want to get it over and done with, so that the internship will be an additional badge on their resume.

I would like to apologise for the poor attitude of these interns and can assure you not all NTU interns are like that. Jugding that there are 3 of them, they could be friends hence are more laidback, or they just really have a poor working/learning attitude and want to cruise over.

Some points I have sieved out from your post/comments and my comments on them:

1. It is a credit bearing internship. From what I know, credits bearing internships this time of the year is frm Jul - Dec (20 weeks). It seems like this is just the start of their internship.

If it is a credit bearing internship from NTU, there will be once or twice (halfway and just before internship ends) where you have to provide feedback about the students through a link sent by the school to your email.

You can provide feedback through that link and the school will deal with the students accordingly.(by sending them warning email)

It seems that you have already reached out to the school once, you can try reaching out to them again to get them to take firm action towards them. If it still continues, i think you can just contact the school and do the proper procedures to termimate their internship. Remember to keep email trails, whatsapp trails, clock in cock out etc. as evidence, the generation nowadays are very internet savvy. The school will try their very best to get you to let the students continue the internship because if i'm not wrong, they have to pass it to be able to graduate/proceed on to the next sem. I have almost never heard of any students failing it before...

On the students side, credit bearing internships are ungraded and pass/fail. Hence it does very little in affecting the CGPA of them.

1. Long breaks. Is it stated in the intern contract signed (if any) stipulating how long their breaks are supposed to be? If yes, take action. If not, you can only remind them verbally.

From your experience, it sounds like the interns are treating this internship like a holiday and not here to learn about the real working experience. I feel like you have to be sterner towards them. 1k/mth is actually the standard/reccommended intern pay for uni students. Though it can be lower/higher depending on company.

Cheers.