Meru Cabs — Excess bill charged

Address: E84 Jharokha Kandivali East

Today I booked Meru cab from T2 Mumbai to Thakur house, Akurli Road, Kandivali East.During I have paid 120 and it was said to Taxi bill will as per meter Reading.But after reaching destination bill generated it was Rs 831.However there was Nil traffic today and it took only 20 -30 minutes to reach my destination.The fare was overcharged .I am regular flier .I have never paid so much high bill to ola and any other taxi even in pick hours.
I think this is very disgusting and company like meru is cheating the customer and false bill is being generated.
There is not issue if overcharging of Rs300 more, but this fraud with customer.If my complain us not resolved within 3 days, I may go to consumer forum
What is the basis of high charging of bill.