Ola Cabs / Ani Technologies — extreme hike in fare

I was travelling like usual from my place to airport for which i usually pay 260-500 even for the peakest hours.infact the Uber was showing 260 rs only but the cab was taking time so I preferred ola . Wen i initially booked there was some issue with their system and it din show me the fare estimate and as I was getting late I booked it that way. When I reached my destination it showed 886 which is far far as expected and now these guys are not helping me either wen i spoke to them on customer care. This is completely unethical and not justified to ask for any amount of money at the end of the journey where a person can't deny to pay. Please look into this matter and help me..