Refund not yet credited irrespective of correct bank a/c.

For AY 2015-2016, One of my client got an intimation order u/s 143(1) with a refund amount of Rs 10,694/= ( after adjustment of demand ) on 23/07/2016. But unfortunately till now,refund amount not yet credited to his bank a/c .
I am 100% sure that everythings are correct, bank a/c is correct , ifsc code is correct but till now refund amount not yet credited to his valid bank a/c .
 

And i m really surprised of this matter !!!

Now what shoud i do ?
Thanks