Workplace in busan

Hello I am currently a worker in busan haeeundae area.
I got a question that has been bugging me dearly

So by doing some research it is said that anybody or everybody who is a freelancer contract or a 4 insurance contractor with the company has 15 days paid vacation days by law every year. *correct me if I am wrong*

But the hagwon I currently work in told me I have only 2 after working a year with them and they told me that I spent my vacation days on summer breaks and winter breaks... which I dont recall at all of spending it there

Is this normal? Is this a type of fraud? Just wanting some good feedbacks please!

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