Ended up submitting a physical request letter at the BSNL CSC near my house to get my plan changed to Super Star-1. Submitted the request at 11 AM or so, I could see the service request created in the system through Selfcare at 11:17 AM.
Got the Hotstar activation message at 1:30 PM or so. My previous plan was Fibre Value, so plan speed etc remains the same, just the quota gets reduced to 1000 GB and will get Hotstar premium.
@shashankb I think the plans would stay. They keep extending them anyway right. Although for me, I find the Super Star-1 better for my use cases. I have no need for more than 1 TB of data per month at the moment.
After I was unable to downgrade my plan to Super Star-1 through selfcare, I had twitted to BSNL through their twitter handle. For the past few days I have been getting less speed of around 95Mbps against my usual 200Mbps. When I have checked today, I saw that my plan has been downgraded as per request over twitter. So getting less speed as per new plan !!!