Fraud by Samudra hyundai meerut up

I booked Aura cng with Samudra Hyundai meerut up on 28.10.2020 at rs 8.15 lac on-road cost,and transfer rs 50000/- by neft on same day and they promise to deliver car on 12 nov 2020 on dhanteras, but on 10th Nov they called me and asked me to pay 8.25 lac means 10000 more which ,I refused to pay and sent them a legal notice ,but at the end of day I have deprived off my car, so friends are cautious at the time of booking and have everything in written don't go by their words, they are ever ready to cheat you by hook or by crook