How would you handle this?

We received an order in the afternoon from a company we occasionally work with. The order called for a search in one of my distant counties. (A 220 mile round trip).We returned the results the following morning.

Today I received a call from the company representative saying the order was faxed to us by mistake so they were surprised to receive an invoice from us. They intended to send the order to another abstractor and had in fact sent the order to her as well.

So now they have two results and do not wish to pay for ours. On looking at their original request I note that they did in fact have another company's name in the "To" field but with our fax number. At the time, I assumed this order had been forwarded to us due to some inability of the other searcher to complete the request. Or that it was an order forwarded from their own client to some branch of the parent company.

They say I should have noticed their error and called them before proceeding and that it was my error not to do so. I want to be fair but I don't really want to be out the money for an order they never should have sent to me if they didn't expect me to do it promptly.

What do you think?
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