How did you pay security deposit to the company? Was it through cheque or it was deducted from your salary? If it is former then do you have photocopy of the cheque? If not, then do you bank statement for that particular month? If it was deducted through your salary then do you have the copy of the salary of that month? If yes, has this deduction been reflected?
What are the terms of refund of the security deposit? Have these been enumerated in the appointment letter itself or some separate letter has been issued? Have you completed the notice period or you have left the employment without completion of the notice period? Is the refund of the security deposit linked to the fulfilment of the notice period?
There are so many questions associated with your post. Please give complete information which will help senior members to give you further advice.
2nd February 2017 From India, Bangalore