NIIT — certificate is not providing, even after I paid full fee

Address:	Hyderabad, Andhra Pradesh
Website:	Niit

I am sai aditya gudimella from hyderabad. I completed my hadoop certification course in niit hyderabad, in july, all my batchmates received their certificate, but still now i didn't get mine.. I am facing lot of trouble, i can't able go for any interview due to my academic is non-it.in hadoop, 3 batch are completed but still non got placed.. Not even single company came to niit for placements related to hadoop, and i am at least trying outside, but i didn't get my certificate from the institute, so i can't able to attend interview. I paid full amount of fee which was agreed at the time of admission.. But now i don't have any idea why the institute is lagging to give my certificate. Please consider this issue seriously and provide my certificate as soon as possible..