If you have any complaint on the services rendered or concerning behavior of a superintendent of post office, you can register your complaint in the following ways: At Post Office: You can use the Complaints and Suggestion Book for complaints pertaining to services or concerning behavior. It will be provided to you when demanded. By hand or by Post: You can send your complaint to any of the Sevottam Compliant Customer Care Centers in the country, or to the Post Office where transaction took place, or to the Office of Senior Superintendent of Post Offices. Online: You can register your complaint online on IndiaPost Site or at www.pgportal.gov.in