State Bank Of India [SBI] — Issue me cheque of income tax refund amount Rs.8640 with interest and correct account no.

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Sir I had received cheque of income tax refund amount Rs.8640.But as account no. mentioned was wrong, i had sent it with my cancelled cheque in may 2015 to state bank of India cash management product centre 04266 rajendra house, 31, mahal industrial estate andheri east Mumbai 400093 for making correction in my account no. and issue me the corrected cheque with interest.I have postal registry received slip of 14, -5-2015.But till date I have not received refund.
Details are as follows-
Name- EKTA BUM
PAN NO.-AUWPB4475G
Assessment year-2013-14
Amount of refund on 22 April 2015-Rs.8640
Cheque no. which was sent for correction- 700611
My correct account no. is [protected]
Ifsc code- sbin0001309
Please help in resolving the complaint.I attach relevant documents-
1.cheque having wrong account no.
2.my cheque having true account no.
3.postal registry received slip dated on[protected].
4. 16A form
Thank you.
Date[protected]