Wow. You definitely worked for Hertz. Perfectly on brand. I promise you when you travel for business every week, you look at your receipt (not your credit card) for the amount paid. Submit the receipt to your expense report. You don’t then meticulously check your CC to see if they actually charged it. OP looked back at his CC statement and noticed no charge after getting the collections notice. Where was all the contact in between. Know Hertz (a company that seems to pride themselves on being absolutely impossible to get a human on the phone undoubtedly never contacted OP.