Income tax refund

Dear Sir

I received the cheque of income tax refund amount Rs 82, 520/- .But the account no mentioned was my old bank account, I sent it to State Bank of India, Cash Management Product Centre, Mumbai with supporting documents for reissuing the refund amount. I sent it on 21-02-2015, but till now I am not received the refund cheque

Please advise me what to do next….

Regards

praveen