Originally Posted by
ven0m
The paintless dent repair is intended for metal surfaces that can be bent/pulled outwards. The rear bumpers on our cars are ABS plastic. Professional repair on such body parts is done by sanding the paint at the dented area. Melting/soldering the dented plastic and adding new ABS plastic to the area to fill the hole. After that the surface is sanded, straightened and the complete bumper is painted. i don't know the rates in the US, they are mostly more expensive than the EU, so you can probably expect upwards of 500$ for a professional repair.
Honestly, even if it was a clumsy mistake, I would leave it until you get a bit more used to the car, as you will most likely gather a few more dents/scratches over the first year and you can do a general paint correction later in the day.