8) One of my clients has recently filled the complaints to Regulators; I want to check the status of the same.

You can check the complaints received from regulators & its status from website of NSE and BSE from below path:

NSE Website - https://www.nseindia.com/invest/content/arbitration_reports/report_1a_2016_17.htm

BSE Website - http://www.bseindia.com/investors/invgrievstats.aspx?expandable=3