U/s 119(2)(b)

I have filed a I.t return as legal heir for a.y 16 17 u/s 119(2)(b) of a deceased person after taking approval from ITO. return has been processed and refund determined , but at the time of refund credit CPC shows that pan incorrect or not linked with the bank account , as the person already deceased pan from all bank account has been removed. pls suggest what should do now to get the refund.