UPDATE: Enquired with a few of the ISPs. contacted joister, and was told that their service is temporarily unavailable in my area (for about a month). i was told that i would be emailed info about their plans.
also, calling up dolphin infonet revealed that they have an office of one of their franchisees in my area itself! calling up there, i came to know that they provide HN only here (1&1 and 5net not available), and they have users in my society too. am a little confused about this. although the representative from the office told me that 1&1 and 5net aren't available here, am hoping that there may be some other franchisees here. is it possible?! someone please suggest any alternative option if you can. thanks!