Right. Tata is bad only if they have monopoly in your society. Reliance is bad, always. But afaik, op, if you're still living where you used to, only one society has tata, and none have rcom. YOU too isn't present. Have you yet not got the new plan from bsnl ?LCO, if present, is another option.
Which society do you live in ? Afaik, only Nile has TATA .One way to get the new plan could be to disconnect this line and get a new line installed; and specifically ask the dales associate for the new plan.Else, you could spam the public grievances page with low speed complaints. Have you complained to the GMTD ?
Cromaniac Broadband is available in some places illegally(without ISP license). It does provides some Insane speeds like 1Gbps Unlimited for 900 including taxes and cess:secret:. Better contact him personally for the same hone: