Cogent Data Solutions Java J2EE Developer interview questions

I had attended interview in this company in month of Oct 2017. 3 rounds are there. Written, 1st Interview, 2nd Interview. After 4 day, I recieved a call from them "you are selected for Java Intern position and join from tomorrow". I completely declined it because they was offering 0 rs salary for 6 month period, because I am a fresher. They are hiring freshers without giving salaries. employees works for 6 month without salaries. After that 2 years bond is there.