The staff at the Calgary airport counter kept pushing for an upgrade. When I refused, they looked visibly displeased. While I was picking up the car, one of them sarcastically told a colleague, 'I suggested they upgrade, but they didn't want to. I really don't like this car.' The colleague responded with equal disdain, 'I don't like it either.' Additionally, during the return, I inspected the car with the staff and reminded him that I had rented a GPS and placed it on the steering wheel. He said everything was fine and didn’t verify the charges with me; he just asked if I was paying with a credit card (which was already authorized during pickup). He confirmed there were no issues with the car, so I agreed to the payment immediately. To my surprise, I later found an 'equipment replacement' charge on the receipt after I reached the boarding gate. I reported it to the rental car customer service right away, but Alamo never responded. When I called Alamo's customer service today, they said the GPS was missing and kept telling me they would escalate my issue. It's been two weeks now. Do I need to record the entire return process to protect myself? How can they simply decide the GPS is missing? The inspection staff charged me for it immediately. Are they taking advantage of foreign travelers? The rental contract included airport construction fees and taxes, but these were also overcharged ... what a hassle.