Maruti Suzuki / New Estilo VXi — Petrol Tank

Dear sir,
I purchased my estilo vxi from cometent automobiles , cannaught place, Delhi on 2nd November 2009. When I refill my fuel tank suddenly fuel comes back, i told my problem to dealer, maruti authorised service station , ghazi pur and maruti own service station in okhla, but they told sir all cars fuel tank is like this, there is no fault in ur car fuel tank or fuel pipe, But am i fool my friend have two more cars one is alto and the other is esteem. But in this cars there is no any fault. Please solve my problem , i m not happy with this product