Bharat Sanchar Nigam [BSNL] — deactivate service wallpaper 55050

Service wallpaper 55050 has been activated in my mobile without my knowledge and an amount of rs.7 has been deducted on 08/02/2020. There was no messages or phone calls before the activation. I want to deactivate the service and get the money back as soon as possible. And i also want to block any such calls or messages or popups. Kindly request you to do the necessary for the same.