When آپ تبصرہ on a پروفائل wall, the پرستار whose پروفائل it is always gets a message in his یا her ڈیٹس اپ about it, but obviously they sometimes don't reply. When آپ تبصرہ on a club wall, only people who choose to look at the دیوار section see it (I think the same is true for personal clubs).
Yep. I sometimes forget to check my دیوار and see a تبصرہ only after few days. If آپ need to reach someone, آپ can try writing on دیوار and also pm them