Law / Help regarding Poland's National 'D' Visa Appointment at Mumbai Consulate! [719]

Hi all,
I recently attended the visa interview to get my student visa..After 3 weeks my visa got rejected.
The reasons they gave for rejecting my visa are
1.Justification for the purpose and conditions of the intended stay was not provided.
2.The information submitted regarding the justification for the purpose and conditions of the intended stay on the territory of Republic of Poland was not reliable;the purpose of your stay cannot be considered credible due to available information or objective circumstances indicating the purpose of your intended stay is different than declared.

Do any one know abt this let me know..thanks