In the UK that would have been secured down by using straps around the wheels. What a shame that it was handled so roughly.
I would try to bend and hammer everything back as near as possible into alignment; the mounting point should give good leverage. Then examine to see if any parts of the steel are ripped or spot-welds pulled out, which would then need some straightforward welding which any bodyshop could do. That could probably be done without any external damage other than a bit of flaked paint off the lower flange of the sill. It has been repaired and filled before so the damage may be highlighting some pre-existing corrosion or poor repairs.
It's an awkward area to access for welding but the panels are available, but any repair sections would be easy to make.
Main thing.....your chassis, safety and alignments are unlikely to be affected.