When আপনি মতামত on a পরিলেখ wall, the অনুরাগী whose পরিলেখ it is always gets a message in his অথবা her নবীকৃত তথ্য about it, but obviously they sometimes don't reply. When আপনি মতামত on a club wall, only people who choose to look at the দেওয়াল section see it (I think the same is true for personal clubs).
Yep. I sometimes forget to check my দেওয়াল and see a মতামত only after few days. If আপনি need to reach someone, আপনি can try লেখা on দেওয়াল and also pm them