First, if your FUP is reset out of turn, you should ask about it to someone at BSNL. Book a complaint may be. Book a complaint for low speed as well. You can download something from Microsoft or try speedtest.net to see what your actual speed is.
What is your plan speed ? Please note that you will not get ~ 2Mbps download speed with all download. In order to save bandwidth and beat spammers / hackers, some websites offer downloads at lower speed. Mostly file sharing websites give pathetic speeds in free plans. The reason why I talked about Microsoft is that they offer high speed downloads.