Hyundai Motor India — fuel cheating during service from center

Address:

Lucknow, Uttar Pradesh, 226022

When i gave my car to service center my fuel was 2 points with meter reading of 23717kms... When i received my car fuel was 1 point with yellow light on and meter reading was 23722... Where my fuel has gone? When i complaint to manager about it he said that it happens when u drive the car... His mechanic said that the head of fuel tank gauge is not attached... Now i want to ask who has detached it because before going to center it was attached and working properly.. They might have stolen fuel from car and trying to hide it... Now i want to make attention to hyundai authorities that this is happening in your service centers... Please solve my problem and make sure that this thing will not happen in future...