Reliance Digital JN Road Rajahmundry - Fraud commitment of AC Installation

I purchased Diakin ac from Reliance Digital store, Rajahmundry...At the time of purchase I paid for Installation also (as they said that Installation from their side is mandatory) ₹****/-
But they failed to arrange installation at committed date...later their technician came and seen the site and asked ****/- extra....as he declared it as risk zone... but the location is at accessible height for *.* feet person....I didn’t agree for extra money so he went back and he told that he will make an official cal from their office...but he didn’t...so next day I talk to their service manager and take that technician to conference in that cal he increased ₹****/- extra charge to ₹****/-( mentioned that it was risk place) mean while technical department didn’t responded well...
So I engaged another technician from outside and done Installation pretty good with out any extra pipe required...and set up the at accessible height....
So please go through this case and solve it