No service but expect full payment

I am still awaiting post from last year and the Post Office now expect me to pay in full for another year subscription to my PO Box. Then, because I didn't pay in full, the Post Office locked my PO Box. The Post Office provided no services for months but expects me to pay for that non-serviced period. <br> <br> I tried to contact the customer service number...no answer. After 20 mins of listening to some stupid recording telling me to be patient and that my call is important to the Post Office, I eventually decided to email Customer Service (which doesn't seem to exist). After emailing, I got an \email rejected"message informing me of the following: \""Delivery has failed to these recipients or groups: [Email Removed]<br> The recipient's mailbox is full and can't accept messages now. Please try resending this message later"