Write a report and make it as condemning as I can.
In Austria, no football game is allowed without an ambulance already at the field, and an emergency MD is only minutes away. Nobody ever prevented the ambulance from driving onto the field in case there was a serious injury with damage to the head, neck or spine suspected. We even had a helicopter land on a field.
In case the injured player has to be taken to the hospital, we wait for the next ambulance to arrive at the field, unless a MD with emergency experience/knowledge is with one of the teams.