No idea what prompted Neil's message...he must be quite upset by something to post that note. But I'm yet to learn that anyone requesting trolls to stop has ever led to trolling ending. If his note works, good for him. So they (and I'm guessing whatever prompted the note had to do with Aishwarya because she's the one who's very active and super invested in SM) need to grow a thick skin and move on.
If it's serious, complain to the police, if it's horrible, hurtful crap posted by an anonymous troll, nothing you can do about it. There's millions of them and it's just part of being a celebrity who chooses to be on SM. You can choose not to be on SM. There are celebrities who aren't on SM at all. That is certainly an option.
You can also choose (and honestly, you should choose this for your own sake!) to not post uber-personal pics on SM- it's immature, and its asking for trouble, especially if you have a million followers. And if you keep commenting "my husband", "my wife", "I love you" on each other's posts like lovesick teenagers, expect to be mocked. I'm married, and my husband and I say I love you to each other all the time, but never on a public platform- because that's between me and him, not me and him and all the random people we are connected to on SM. If I were a celebrity, I would shield my relationship even more, not expose it. And in an age where people manipulate digital media easily, you are giving the trolls more fodder.