I'm currently using BSNL's Home 500 plan which has nighttime unlimited usage (IST - 2:00 to 8:00). I found that although the traffic column in my service order for nighttime usage shows 0, the counter above has clearly indexed whatever I had done. Do they dicount what you've done later on from the Total Used (GB) column or are they cheating the customers and counting whatever was done at the time?