Validity of home based work

Dear Sir/ Madam,

I wanted to know if the 'home based work' against security deposit is legal?

Because I was working as a home based worker(Typist) and after submission of my work they send me a report where they pointed out all of my mistakes and they have terminated me for poor quality of work without paying anything as per their terms and conditions they sent me before I hve paid Rs.900/- as the security deposit and their service charge.

Please advice what should i do now?

Thank You