Poor fuel , poor gear box and faulty fuel indicator

Brought the car from shinrai toyota worli, almost 9 months back, drove 10600 klm, biggest problem iam facing is the gear box from the day I brought the day, already complained four times , every time I go they give excuses, till date issue is not solved, another problem is the fuel it's very bad in city 10 and highway 13 , another problem is the fuel indicator , reserved light comes on much before, then after driving for around 50 to 60 klm it's goes off , then again it comes up so never comes to know how is the fuel left in the car. All complaint is not solved yet gives all kind of explanation and very poor in service. Brought 2.4 GX model