2003 mercedes cl55 amg key wont turn

just bought car everything worked shut it off n went to leave n key wont turn bought new kkey from dealer key worked locks n lights put in ignition and computing data please wait come up waited forever teied to turn key then it said remove so i did put it back in and wont turn again nor locks dont work n loghts dont flash bought new car battery and cr2025 for key fob and still same wont turn please help thank you