Audiovox SMT 5600 / SPV C500 (HTC Typhoon)

I already sent the phone in once to have the screen cleared of dust and now it is dusty again. They said they'd seal it, but clearly they did not. I have the 4 screws out (they took of the warranty sticker and did not replace it luckily) but still cannot get the top panel off. I can pry in between the silver side piece and top black piece but it feels as though I am forcing it. Compressed air alone only moves the particles around. Please help! Thanks.