Can you explain this dichotomy then? You say people who vote are lower caste, and those who "don't vote" are upper caste, yet the upper castes control the government.

Are you saying then that the voting is fraudulent? Or that lower caste voters are voting against their interests? Or that there are restrictions on the candidates that are available so voters are only given the illusion of choice? E.g. for lunch we can choose between KFC, Taco Bell or Pizza Hut, but they're all actually the same company.