Paintless dent wizard type repairs are for metal only as they involve forcing the dent out with a series of specialized tools. Plastic does not give the way metal does. I don't think there is any way of fixing such a dent without filling and repainting or maybe heating it up which would be risky at best and still require repainting.
Sorry about your problem. Did insurance cover this? Just get a new bumper. It was not your fault right?
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