Ola Cabs / Ani Technologies — the rate was higher than the estimate fare

When i booked ola from valasaravaakam to kottivakam the fare showed 240rs. But end of the trip the fare was double, 483rs. This is so unreasonable. The fare shouldn't be showing this much. Even though it's a public holiday this is ridiculous. I need a solution for this. I better receive refund if not i'll have to sue the company. This is unnecessary expense on a holiday for me.