Airtel — about the network speed of your broadband connection

As i am using the Airtel broadband connection, which cost monthly Rs 999. and they are giving the ads and broshures saying that the network speed will be 40 mbps .and i am not getting the proper speed which they are telling ... the speed which i am getting is below 1 mb some times 2 mb.the techinician who comes from the airtel to resolve our problem is not satisfied .. they are making as fool by saying... the download speed will only 2 mb. the speed which the airtel shows in their brousher and ads, ie, 40mbps was only for browsing . they told us they cant resolve our problem