The whole broadband scenario is a joke. Firstly, neither BSNL nor MTNL had the infrastructure to offer 2Mbps connections to all. So, now when their customers have to do with variable speeds ranging from 256kbps to a unit mbps, they throw absurd plans along with the data transfer anomaly you pointed out. If I am not mistaken, MTNL previously calculated data transfer on download alone. All the Triband plans are absurd. What is anyone supposed to choose if you have an above average surfing frequency? Caps like 400MB, 700MB and 1.25GB on 256kbps+ lines only do good to MTNL. Many of the BSNL subcribers too are suffering from low connection speeds past few weeks, especially those on UL900. The year 2006 was a lot better for broadband. 007 would only make people loose faith in broadband due to fear of huge bills or curbing their desire to surf and download.
For the records, MTNL Triband ads have even made their may in digit magazine minus the 'upto 2Mbps' part.