The Hanoi-based English center where a teacher was previously caught calling a student 'pig brain' has been found operating without a legitimate license.

MST English Center has yet to obtain a license to operate as a foreign language training facility from the Hanoi Department of Education and Training, a departmental representative confirmed on Sunday.

The center has three facilities, managed by the MST Education System JSC, whose legal representative is Nguyen Thi Kim Tuyen, according to the department.

Tuyen is also the teacher who was filmed yelling at a student and calling him 'pig brain' inside her classroom in a video going viral on social media last week.

Kieu Van Minh, an official from the education department, said all three facilities have been shut down after the video caused a stir on the Internet.

However, department officials are still unable to reach the leaders of the MTS, he added.

“We will continue investigating the violations of this center,” the official added.

The English center attracted media attention after the video was posted on social media on Saturday. As of Monday morning, the footage has attracted more than two million views.

In the nearly two and a half minute footage, the teacher insisted that one of the students in her class pay a fine worth VND100,000 (US$4.4) as he had broken the center's rules by not handing in homework on schedule.

However, the leaner refused to do so and called her a ‘fraud,’ before the angered teacher started using offensive words and calling him 'pig brain' and 'pig face,' which means 'extremely idiotic' in this context.

The English center highlights on its official website that 'discipline of steel' is applied at the facility, stressing that fines from VND50,000 ($2.2) to VND100,000 must be paid if learners fail to hand in their homework on time.

Learners are required to sign a commitment to comply with such rules at the beginning of the course.

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