Experienced awful customer service from an older l...

Experienced awful customer service from an older lady with blonde hair. I had two packages that consisted of books. I continued to tell her that and she didn't charge me for the book rate. She was trying to charge me $11 for one & $15 for the same exact books/same location. I took them to my local post office and paid $4 a box. When I asked why the price was so high, she told me she didn't know and it was just what the computer was telling her. I asked if she could explain why the price difference and her response was "I don't know." I'll never go back to this location again. I work in the book business so I sent out 3-4 packages weekly.