I did the same damage to mine a not long ago. I used the bumper repair stuff from Isopon with good results (i got mine from Halfrauds - more for convenience as the store is close by). It's like standard filler but is flexible (& black). Repainted my bumper & looks good, you would have to be looking hard to see the damage. Bending the inner steel section of the bumper back out was the hardest part.

Flea bay to the rescue n no other visible solution.