TVS Motor Company — In petrol gauge indicate wrong indication

Address: Gandhinagar, Gujarat, 382028

I purchased Jupiter's mileniour
First problem I found not starting with cell, I go to service station and replace part and found OK
Second problem is petrol gauge indicate wrong indication if full tank than after indicate half
So I m confused for in takn there is no petrol
So please solve my problem immediately
Only purchasing month 3
For Dilip