The spending limit is a maximum bill amount that can be reached before we restrict your Internet use.
Data is charged at Rs10/GB, so for every rupee of your spending limit your usage will increase by 1/10th of a gigabyte (a little over 100MB) - a spending limit of Rs1,000 will equate to 100GB of usage, but once the spending limit is reached, the only websites you will be able to access are Hayai's, it's payment processors and the Hayai Zone.