If I do not respond to the notice regarding the renewal (SMS), what will happen to my deposit?

On a monthly interest payment fixed Deposit, the capital will be renewed automatically with the prevailing interest rate for the same period. And, if it is a maturity deposit the capital will be renewed with the accrued interest / without accrued interest (as per to the instructions provided in the FD application) and will be renewed for the equal period at the prevailing rate.