If yours is a geartronic then it is possible that the transmission cooler in the radiator has failed.
IF this is the case
You must get this sorted immediately as you now have coolant mixed with trans fluid in the gearbox as well as the engine cooling system.
You will need to fit a new radiator with combined oil cooler
The gearbox fluid will need to be changed fully
The cooling system will need to be flushed and cleaned to remove as much oil as possible and you may well need a new coolant bottle as cleaning the old one will be very difficult.
Many advocate changing the coolant hoses as well because the oil causes them to rot from inside out over time
