You are interested in a teaching career and you have done your MCA.
What you need first is try and somehow get into the teaching side. I would suggest focussing on clearing the NET exams and try and apply for the teaching posts as a lecturer in the public and the private sector. You can even consider the defence posts/ISRO posts related to research if the age limit permits.
Once you are in a teaching job, then you can consider joining a distance education program from IGNOU.
IGNOU offers M.Tech in (M.Tech in Advanced Information Technology with specialization in Software Technology, Advanced Information Technology with Networking & Telecommunication,Nanoelectronic,Nanotechnology, Advanced Information Technology with specialization in Intelligent Systems & Robotics).
I say M.Tech because many sectors consider BCA/MCA as equivalent to B.Tech or B.E computer science only.
Once you finish your M.Tech, then you can choose PhD in Computer science from IGNOU.
As you gain work experience and move on from lecturer to assistant and associate professor, you would have completed your M.Tech and PhD in 4-8 years. This would give you the adequate teaching experience and the qualifications to apply for associate professor and professor jobs in the teaching field.
If you are really good in your studies and have age on your side, you can take the GATE and NET exams with your MCA and then aim for a PhD in computer science from one of the IITs, NIT, IISc, BITS Pilani or the other univerisites like BHU, Vellore Institute of Technology.
While you are doing your PhD (with your MCA and NET) you can try and do some part-time teaching jobs or a fixed time job in evening colleges to get some teaching experience on board while you complete your PhD.
Then with you MCA + PhD and some teaching experience you would be eligible for some of the teaching posts in public or private sector.
If you can afford, the consider a MS in computer science or a MBA in computer science from a reputed college abroad and then try your entry at as teaching faculty in some of the premier centers of IT/computer colleges in India.