HDFC Bank — Cheque misplaced!!!

Address:

Kolkata, West Bengal, 700053

On 14th Nov'15, in New Alipore, Kolkata Branch, I dropped a cheque # 594302 belonging to Alipore SBI Branch, Kolkata, amounting to Rs 3, 15, 000. I dropped the cheque in the attached ATM counter cheque drop box, after completion of all documented formalities.
On 16th Nov'15, I met Ms Lipika, the same branch Manager, since the amount did not get credited in my account. She said to wait for 2 days for the cheque to be cleared.
On 21st Nov'15, I met Lipika again, as the cheque amount was yet to be credited, she made me write a detailed application, narrating the incident, for her to investigate with the Clearance Team.
On 23rd Nov'15, at 5 pm, I received a call from her, stating that the cheque cannot be traced and the clearance dept did not receive any cheque as such. She also said that, she can issue a no-clearance certificate from HDFC regarding the same.
On 24th Nov'15, I collected the same doc from the said branch.

But the question is, where is the cheque ? How can it disappear from a drop box which is attached with a secured branch ? How can HDFC shrug off their shoulder stating, we did not receive any such cheque ? Who will take the responsibility of the loss ?

I need my cheque back…Please help.