The service is always friendly however I was overcharged and she didn't realize it. I pointed it out and she still thought it was right.  She tried to explain that it was tax, which it wasn't because the base price was $4.55 instead of $4.15.  She asked me to speak to her manager so she could explain it to me.  The manager acknowledged it was wrong but said that they don't set the prices so they can't help.  Wow!!