Working in malta with wrong visa

Hello, my brother was studying in malta, and after three months with a renewed student visa he started working and studying, the owner wanted to hire him an sponsour for a work permit, but the id department appear in the place and asked him for visa status while he was.working, and then he realised with a letter he need to apply for a worki.g study visa.
My question, is, can he still apply for a work permit sponsoured, or he has to leave the country, This is so unfair, please any help

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