Mahadev book customer care as well as 24×7 Mahadevbook Whatsapp Number (where offered), along with their Mahadevbook id and live chat link. The live chat is suitable for quick questions, while the email is best for document checks and keeping records! A telephone line is suitable for pressing issues; it is advised to have your Mahadev book ID and any reference numbers associated with the transactions so that the Mahadev book team can easily find your information.