Down with the MAN

When I started working, no one told me when paychecks came or where to pick them up. Apparently, because the store where I work is located in an area where most people live paycheck to paycheck, they come every week. Since I didn't know that, I didn't pick up the first few until a few weeks into the job.
When I was getting my checks, I discovered that one of the weeks was missing. Also, the first three days I couldn't punch in because I wasn't in the system, but the manager promised me he'd take care of it. When I got the check, though, I hadn't been paid for those days either.
Of course, when I told the store manager about not getting paid, his reaction was that he had no proof I worked those days. He told me I had to get proof from the pharmacy manager that I had worked and what hours. After the pharmacist told him I'd been working, he then tried to cover his ass by saying that he couldn't just pay me for those days because of the system, that instead he'd been adding hours on here and there to my paycheck. I'd been keeping track of my hours (in case of something like this), so I knew that only one hour had ever been added. The store manager finally said he would get a check for me, and look into the missing check.
Today he comes up to me and says that the missing check was cashed, so now I have to undergo a handwriting verification to prove it wasn't me. He really pissed me off, because his whole attitude both times was that I was trying to cheat the company. Of course, I told him I'd give them signatures or whatever the hell they wanted, because I didn't cash the damn check. I hate being treated like a criminal.
I mean, seriously people, think about it. As a pharmacist, I will most likely be earning close to $100k. Why the hell would I try to cheat a potential future employer of a check not worth more than a few hundred dollars? Not only would I never be able to work for them (not that I ever would now), but if my university found out that happened while I was on co-op, I'd get kicked out of the school. They must really think I'm stupid (and have criminal intentions).
There's only one thing to do...
You've watched Office Space... you know what to do! *cue Ghetto Boyz music*