Good Luck with the credit card company.

Only once did I need to call Amex with a problem. I got my monthly invoice and saw a hotel had overcharged me by a night. I called the hotel (a national chain of moderate to high quality) and they asked me to "prove" that I had only stayed 2 nights and not 3.

Amex took my word for it, took the charge off and fought with the hotel directly.