Diploma

Hello Jagan,
You chose to do diploma in engineering but now are not interested in doing graduation in engineering. Correct? What is your passion? If it's not Engineering then time is now itself to change stream to the one in which you have passion. Don't bother about lost years at this stage.

There are very jobs available in ECE. You can try for government exams like Delhi Metro, AAI or RRB, AFCAT etc. Other option is you can go for B.Tech from good or reputed engineering college and try for job. You can also give exam like E-LITMUS or AMCAT for job but that also after B.Tech would be be

NUJS does provide a PG diploma, you check for further details on the website:
http://www.nujs.edu/nujs.html

Students even after B.Tech and MCA are struggling nowadays to get a good job. I would recommend you to go for graduation at least and then look for jobs.