Bangalore University — according to my diploma certificates am not receiving certificates from my college age

Iam Nagaraj and diplama student (EEE) At govt college and i was done my 2 years diplama regularly and passed remaining 1 year was am upsent to college due to few resons and that to i taken permision from colege and i wrote exams finaly i was passed, now i need certificates for my job i went to collegefor my certifiacate but they saying wont give cerfictes beacuse ur not regular student and i wont give open certificate also (if you came regularly tilll 6 moths then i will give you regular certifictes ), i was done my diplama how its posible to attend the classes now i have good oppertunety at wipro but i holded due to certificates

No initimation about rules and regulations till my completed my diplama
i payed my exam fees and internals exam in my college only.that time also no intimation

what i do...how can get my certificates...