Such damage is not normally covered by warranty, so none of the warranty-related channels are of use to you. If you purchased additional insurance on it, then you should first seek advice from your insurance provider.
Beyond that, I recommend you find a local (to you) shop that has a qualified BB hardware technician to provide you with an appropriate evaluation and estimate. If you know of no such shops, you might ask around of the carrier shops or other mobile supply shops in your area.
Occam's Razor nearly always applies when troubleshooting technology issues!
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