Are you insured for this type of problem.If so replace the sub.
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I would see if you can get a direct factory replacement from the manufacturer. Many companies will sell you a replacement part. You may be able to install yourself, depending on the actual dammage.
If there has been a lot fried and melted inside the sub, that may mean repair is unlikely. Look inside the sub first before you commit to buying any replacement parts.
You may also want to check the resistance of the driver. You can do this with a simple DVM. If the driver is toast as well, the sub may not be worth fixing.