You have completed ITI and a Diploma in Electronic and Telecom engineering. A higher education should be to gain a degree that will enable you to have a better chance while you apply for a job.
There are many colleges that offer a lateral entry for students who have done their ITI and Diploma in engineering. You can choose an AICTE recognized college and apply for you B.E or B.Tech. The need for an entrance exam for this route varies between states and the universities. Although the rules vary slightly your Diploma should be from a recognized center, 60% marks and age between 18-28 years.
Once you complete your BE or BTech, you can take up the GATE exams, that will be useful for further PG studes or seek employment in the public and private sector.
If having a job now is more of a priority and then work towards a degree, You can seek employment based on your ITI and Diploma, then enroll for a distance program. IGNOU offers B Tech Civil where in the eligibility includes Diploma in engineering (http://www.ignou.ac.in/ignou/aboutignou/school/soet/programmes).
The Delhi-1 regional center offers BTech in Mechanical Engineering (http://rcdelhi1.ignou.ac.in/programmes/detail/375/2). After a promotion or change to a higher job following your bachelors, you can do your masters from IGNOU which offers M.Tech in 10 sub-streams (http://ignou.ac.in/upload/Master%20Degree%20FC_2012%20New.htm).