Hi,
Make a note " Company is liable to do employee varification from previous organization after accepting offer letter/joining and In case any of credentials proves to be fake or false,your employment will be terminated with immediate effect" add it in your offer letter or offer letter mail.
If you had mentioned it in your letter,situation would not have been this worse.
For now do not make any official communications and also prevent phone call as it can be record. Tell him that you provided fake documents so we are lodging a complaint in PS and cancelling your offer letter
Make a note " Company is liable to do employee varification from previous organization after accepting offer letter/joining and In case any of credentials proves to be fake or false,your employment will be terminated with immediate effect" add it in your offer letter or offer letter mail.
If you had mentioned it in your letter,situation would not have been this worse.
For now do not make any official communications and also prevent phone call as it can be record. Tell him that you provided fake documents so we are lodging a complaint in PS and cancelling your offer letter