You missed these words, “shall
observe the following due diligence while discharging its duties” & “and shall make reasonable efforts”. That is why I said lawyers exist for a reason. Cases have been won & lost over a punctuation mark let alone with these many vague words (how much is “due diligence” or how much is “reasonable”). What this means is that TE can win a case in court if it hires someone like Kapil Sibal but it may also lose the case despite hiring him but what is certain is that TE will end up spending a lot of money if it ignores those notices & get dragged in court.