If you never link your Mobicel with your Gmail account then I have both good and bad news for you.
The bad news is that you will have to hard reset your phone to factory default to unlock it and lose every thing you had on your phone" phone numbers stored on phone memory, music, pictures, applications' in fact your Mobicel metro will be as good as new.
The good news is that' we have the instructions to hard reset your Mobicel Metro on this link: http://satechhelp.co.za/422/Hard-Reset-Mobicel-Metro
Please comment below for further assistance.