Respected Sir/Madam,

I would like to inform you that I have lost my cheque book about one month ago. I kindly request you to take the necessary action to stop payment against any cheque issued from the lost cheque book and issue me a new cheque book at the earliest to prevent any misuse.

I shall be thankful if you could process my request as soon as possible and confirm the block on the lost cheque book. If you require any additional information or identification documents, please let me know and I will provide them promptly.