[Resolved]  BSNL — sudden charge for night usage (2am -8am)

I have a BSNL broadband connection[protected] with plan 650FN (night unlimited). On 8th July i received my BSNL bill in which it was mentioned that from 1st of july download during night would be charged, but till that date i have downloaded 12 GB of data. Now as the information was given to me after 8 days this download should not be counted for bill as the delay for informing me about change of plan details ?is on BSNL part. Now i got bill for July and BSNL have charged 1000 rupees extra for the download which I have don under my night unlimited plan. As a customer i should be pre-informed for any major change of plan so i can schedule my usage, now i have changed my plan to 1445(unlimited usage) I request you to get the bill corrected as per above description and exempt my night usage from 1st to 8th July. I have lodged written request to BSNL patiala head office on 11th July as well as ONLINE CUSTOMER GRIEVANCE portal (PJB/CO/2014/11491) on 31st July, but have not got any revert