The panic appears evident in your "ALL CAPS" writing, which should generally be avoided unless you MEAN TO YELL
The placement of TGV trains at a station such as
Gare de Lyon or
Gare du Nord is
impossible to tell before the station traffic control directors decide it, which can occur literally minutes before the train arrives. So, calling somebody, whomever that may be, would yield you no better information on where a train will be parked, than if you were at the station itself and were watching the large departures board.
Best regards,
Ben