Reliance Jio Infocomm — security deposit not received

My number is [protected]. I was a postpaid customer and migrated to prepaid. While inquiring about security deposit refund during migration from postpaid to prepaid, it was stated that security deposit will be send as cheque to the communication address. But no cheque received so far. I wrote a mail to [protected]@jio.com regarding the issue. But no proper response.

Let me know when will i receive back security deposit 400.