They blocked my PO Box

Hi Peter,<br> <br> They have done it again!<br> <br> I am so disappointed by Post Office during January I have made payment renewing my post box I was given a receipt for ***.<br> <br> On Saturday 7/03/2015 when I went to check my post I found that it is locked from inside, they inconvenience me like this every year. Should I tell them every year that I have paid my account or it's their duty to check everything? Can someone start taking their job seriously now? i am expecting some important mails but post office decided to close my post box<br> <br> Can someone at post office tell me what causes this kind of inconveniences?<br>