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In hand support from a qualified BB hardware technician is all that I can think of. If the people you tried couldn't help and you don't trust them, then try another. But I've no clue as to exactly who, in your region, you should try.
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.