Assigning named sub-object materials in script

I’m working on a UI for assigning materials to surfaces. I specifically want to assign to polysurface faces. The UI has an alpha list of materials in the file and an “assign” button which prompts for a selected surface sub-object.
The below script is supposed to assign the named material to the surface, but its assigning another material instead. Can anyone tell me what I’m doing wrong here?

doc_materials = Rhino.RhinoDoc.ActiveDoc.Materials                

for i in range(doc_materials.Count):                
    if doc_materials[i].Name == str(self.selected_material):                        
        brep = rs.coercebrep(self.brep_id)
        if brep:
            the_face = brep.Faces[self.selected_face_index.Index]
            brep.Faces[self.selected_face_index.Index].MaterialChannelIndex = i
            break

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