Fraud done with a cancelled cheque

Dear sir, I had issued a cancelled cheque to a broking firm for opening of demat account. I had clearly crossed the cheque and wrote cancelled in between two lines. On date 31/03/2017 my bank statement showing debit of Rs. 200000 with the same cheque number. Further I got this information from branch manager that someone changed my registered mobile number. The application for change in mobile number registration does not contain my signature someone else tried to do my signature. I asked branch manager to provide me the authorization letter written by me, but he could not produce the same. Neither he showed me any xerox of id and address proof. The person who changed my registered mobile number came in the Bank on 17th March 2017 as per the Branch manager. I would like to know what option I have available so that I can get back my hard earned money. The person in which account the amount get credited had withdrew the whole amount. I have a scan copy of the cheque received from broking firm's email id. Further Hard copy of the cheque with stamped of the broking firm. And other relevant information copy received from Bank. Please help.