I have been mysteriously short on my rent payments twice recently with the apartment complex I am residing in. Paying by check, I am later notified that I am odd sums of money short of what my rent should be. According to my bank statements and assertions from a bank employee, my checks have been going through in their entirety. Speaking with apartment staff, there are no additional fees, or anything else I could be getting charged for. This is theft. How should I go about this? What can I do?