NIIT review: fraud regarding degree 41

Hello,
My name is manish kumar and I was pursuing a bachelor's degree course in it from niit. I joined niit in august 2003 and I gave my final semester exams in january 2007. I have successfully cleared all my semesters without any backlog.
I took admission in niit in august 2003 at niit, patna centre. After clearing 5 semester from patna I took transfer to niit camac street centre in kolkata. I gave my final semester exams from kolkata in january 2007.
I did get my marksheets of 1st, 2nd, 3rd and 5th semester. But now it's been more than 1 year but I haven't received my 4th and 6th semester marksheets, leave alone the degree. This degree is recognised from karnataka state open university (Ksou). I have contacted the kolkata regional office co-ordinator of niit mr. Sumit guha, but of no use. I have contacted him several times but he asks me to keep sending mails to ksou co-ordinator. He provided me with the phone number of ksou co-ordinator, mr. Venkatesh. I called him up and as per his requirements I did send him all the details of my previous semesters marksheets. But days have passed by, and I have not received any response from their end. I try calling them up, but no response. I have made numerous phone calls, have send lots of e-mails but that is of no use. I have already missed several great oppurtunities due to lack of these documents.
Niit regional office, kolkata is in no mood to do anything. Their negligence is proving a big hurdle in my career path. I would like to file a case against niit for luring the candidates to join their b. Sc (It) programme and then leaving theim in the middle of nowhere. I would like to register a case regarding this fraud by niit. Please suggest me some ways in which I can do this.
Thank you.