Rapido — Extra fare was charged

I booked a rapido auto for one destination and then had toh change my drop location as it was not showing the route from where I wanted to go ... The location which I changed was hardly 2km away from my pickup location but rapido charged me 80/-to reach there whereas in a basic rickshaw it costs around 30-35/- and when submitted the complaint on their site they say you didn't add the coupons but why do we have to do that ...
And that auto rickshaw driver also tricked me by taking a different route to my drop location and time consuming