Based on the insurance contract you have with them, my bet is that they have that right.
I get that you would like your car fixed but it appears that boat has sailed.
As someone who has seen Porsches with body/frame damage that has been "fixed", I can tell you I would not want one.
Good luck, buy another!
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Most policies give the insurer the option of repairing, replacing or paying actual cash value (market). Start shopping.