Travel websites will sometimes have discounted fares that rival the best rates made available by the airline; it's worth checking before booking directly with the airline. Each company has its own set of Terms and Conditions, however, so be aware of your options for refund, flight changes, and cancellation penalties.
The issue and preferred resolution, in GetHuman527390's own words:
The problem I ran into: Trouble with different pickup-drop off locations
I trust that Enterprise Rent-A-Car will make this right and come up with a resolution that is fair.
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