Hi Shweta,
Getting masters from premiere institutes like IIT/IISc is good option for getting higher studies, but for job point of view there is not much usefull. The salaries are 20% high for fresh M.Tech grad compared fresh B.Tech grad, you have two years of experiance so, in industry point of view its equavalent to M.Tech from IIT/IISc. For doing masters it takes two years, from then again u have to do job so, it doesn't helps much in terms of salaries. My sugestion is continue with present job with two more years of experiance you will be in high position, this is if money is creteria.
This is my view, others may have different.