What to do?!?! Is this Mail Fraud?

I have a PO Box at a mail store and the store franchise owner said there was “too much mail” and sent all my mail back to the post office “return to sender”, what should I do? I have a PO Box at a store near my old addres and I haven’t been back there in 2 months, the owner got upset and cleaned out he back of the store and sent the boxes of mail back to the post office with “return to sender on them”, what should I do? When I confronted her tonight she got really really nervous. She tried to say I haven’t been back there since May 2011, which isn’t true because I have mail dated from when I was ther last in late November. She said the contract stipulates that I have to pickup my mail regularly which is true, but can she do this? Should I reaise hell with the franchise? Should I contact the Post Manster? More importantly where is my f’n mail from the last few months? I have ordered stuff and sent it to the PO Box and it’s gone. Should I hire an attorney? I’ve since made arrangements to have mail boxed up and sent monthly to my current address I am residing at. I run a small consulting business out of the PO Box so this could really mess me up as tax time is coming up. I keep the PO Box and pay taxes in the state because I am going back to grad school in that state. I pay by credit card for everything I’ve ordered and had sent to the PO Box so I have to go back and contact the vendors and try to get refunds for everything. But what about the other missing stuff? What should I do?