Small claims court... they were responsible for your property, they lost/sold it, and they refuse to compensate you properly.

Also a BBB complaint, and a call to the Police might help... they in effect deprived you of your property, it isn't up to them alone to decide how to compensate you. IMO you should be getting full retail on your original deck in cash.

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Alpine IVA-W200
Alpine PXA-H701 optical
Blade SE6175
Morel Elate 6 3 way active
Sony XM2000R
MTX 12" 7000 x 3 freeair

Finally moving into the 21st century...