Lost Blank check

Issue "stop Payment" to the banker mentioning the number of the cheque.

Irrespective of the proceedings you are going ahead with the co-op bank. Pls mark the stop payment with your bank.

This will avert any untoward incident.

Immediately take "STOP PAYMENT " action by writing to your bank. Take at letter by the Loan Provider Bank that they  have misplaced the cheques.   It is very important in case of future disputes with that Bank. Do not forget to recover stop payment f charges  if any,charged by your bank.  In one case of my friend, the bank had lost the cheques and requested from replacements.  After some years they tried to encash those lost cheques which could not be cleared as the payment was stopped.  Subsequently , the Bank sent this notice u/s 138 of NI Act.  

Beware of these tactics and preserve all the correspondence.

since the cheque is a valuable security give a complaint in writing to local PS regading the same

This is all about lost cheque , giving another cheque take in writting from bank that they have recieved blank cheque from you.

And since they have sanctioned and you have availed loan forget about police buisness it will be useless and may creat unnecessary misunderstanding wuth the bank and staff concerned.

If you are not continuing relations with the bank than you can do all sort of things.

IRRESPECTIVE OF ADVICE OF LEARNED FRIENDS PLEASE DO NOT FORGET BASIC LAW OF SCIENCE THAT EVERY ACTION HAS EQUAL AND OPPOSITE REACTION.

This is Newtons law of gravity on which whole the theories of science are based.

As suggested by learned members.

Write down the minutes of the discussions with the concerned persons i.e bank employee and Manager mentioning their names/designation/date of call made by you or received by you, phone numbers,or in person representation by you mentioning date,bank employee met by you and state that a blank cheque number ....drawn on bank...branch address.....was procured from you by... on Dated.... and the Manager...confirmed it is as per practice of the bank...and reported as lost by... on dated.....by .... and Manager name .... confirmed and stated that you may stop the payment of this lost cheque number.....and issue another blank cheque to the bank under receipt....nd that the bank shall confirm in writing that blank cheque number..... has been lost, and obtain receipt from bank on another true copy of your letter.

Sit  on the head of Manger and obtain the letter assured by him, or submit reminder citing your previous letter and in person representations till you get the desired letter.

Keep yourself safe from tactics .

You may study RBI circulars on fair practices code.