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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!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.