Any imposition of unlimited (or otherwise) plan without taking the consent of the consumer is illegal and amounts to deficiency in service. However, at present, the country is ruled by Adani and Ambani and their cronies so there is nothing the consumer can do about it. And there are blind supporters among the residents who will try to shut down any voice of dissent.You have taken wrong brother ..
Refer to this news link here
For the past four months now, Reliance Jio has been crediting 2GB data per day to its users for a validity of four days.www.indiatoday.in
Jiofiber from past 1 month has been giving unlimited data for the last 2 days of a month which is what you have got in your case.
After the duration time you will go with your normal existing plan dont worry
So either stay quietly without a murmur with their dictatorial practices or switch service provider, if you have any such option at the first place.