so my car was vandalized a while back ago

some guys crowbarred my trunk hoping to steal subwoofers that i didn't even have (acoustic feedback system FTW). anyway, i bought a used trunk off ebay and after installing it, i cannot seem to get the trunk to flush with the left side of my car bumper. the right side looks fine but as you move towards the left of the trunk lid, it steadily rises and rises. everytime i walk past my car i get so frustrated looking at it.
i've done so many adjustments but i cannot for the life of me have it flush completely to my car. any ideas on this? i'm thinking i might just have to go to a body shop and have them adjust it for me. i hate paying out of pocket for this type of stuff. pls HELP!!!
THANKS
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2001 5MT Satin Silver Prelude
2004 SMG Alpine White ///M3