Guys I currently have BSNL Fiber plan SUPERSTAR_300_GB_MONTHLY. The service started on 8th of September and this is being posted on 22nd. I have exhausted the 300GB limit and want to switch to the 600GB_CUL plan right now. I am ready to pay for the 300GB plan but want the plan changed ASAP as the 2mbps is too slow. I am not sure if the selfcare option to change plan does it after the end of current plan or right away.