Consumer Redressal

Hello Sir, I gave my car to GEM Motors, Hydernagar, Hyderabad for an problem (car is getting off when I go in low gears, especially at signals). After few days they called and said it will be 17,000/- to fix the problem then I said OK and go ahead to fix it. After 3 days they called and said it will be 20,000, later on the same day after few hours they said it will be 23,000 including everything. I clearly checked with them and they said for 23,000 we can deliver the car by fixing the problem and you can run it for 1 lakh kilometers for sure. Then I approved it for 23K, but finally they charged for more than 25,000.00 Then I went to my home town on my car and I noticed the same problem, so I gave back the car to GEM and now they are planning to charge me again. Please help us from this loot. Thanks Nagarjuna