Well, typically front is fixed by these tabs on the sides of the front, that click into little grooves. Depending on the case, sometimes you can take the front off first. Mine comes off, albeit with a little more jerk on the bottom first, and then gently pull it away to the top. Some cases need you to take off side panels first, and push the tabs in those grooves in before pulling the front. Do not pull and jerk if it shows no sign of give. Just see if you can pull it off, rock it top to bottom a bit to see if any side gives way first.
Also kanewolf is right, pics would help, zoom in on the seams.