change the accused rank

Please provide basic minimum details so that members can understand the issue with more clarity.  Unless the charges are proved through inquiry, personal hearing, orders from proper disciplinary authority, a further appeal against such orders, normally they can not change the rank/designation.  There is no such rule and regulation to punish an employee even before proving a charge.  They may allocate different duties to avoid tampering of evidence or influencing witness but the ranks should not be disturbed.

Elaborate on the facts applicable to question, which is not a query.