US Post Office Carrier Facility

They lost my package and said it never got to them. I went to this office to show them proof that the package was sent there. Mind I say I spoke with a supervisor at the main post office and he gave me the address there . I asked them to please make sure that they hadn't misplaced somewhere in the facility and the supervisor that works there on Satureday was very rude he started yelling at me and told me to leave that the package would get to me when it got to me. I cannot believe my tax dollars are going to employees who treat their customers horribly. let me add the facility was empty and the supervisor was sitting there on his computer doing nothing just eating.