Non returning caution money after one year

Location/place: 17/380-engineer bagan,bunokalitala,chinsurah,hooghly,W.B-712101

Name of company/service: Bankura unnayani institute of engineering

Sir,I am a B.tech student.I completed my course on july,2012.I have cleared all my fess still my college,Bankura unnayani institute of engineering has not return my caution money,not also give me any assurence in this matter.