edx they wanted a quote and they made us buy parts for them in order to reserve the parts that they never buyed winter springs, Florida

First I received a Call from EDX telling me that they need a part really fast , these parts were on the Farnell's Website . I quoted them , they accepted the quote , they told me that I could buy parts . They even sent me a PO for this order .

Then , when the parts arrived from farnell, I called EDX and they told me that they didn't need the parts no more. In fact there's a sentence that shouldn't be on a regular PO : "This PO is to generate a Proforma Invoice, we must re-quote our customer because of the new pricing compared to previous orders of this part." .

The Problem is that : -they told me to buy these parts because they need them quickly.          

-They sent me a PO , which means they accepted the quote and wanted me to buy these parts.

When I called EDX , they told me to carefully read the PO and that they had the right to cancel this order even if they sent me a PO. What can we do ? The Parts still in our stock , we lost money on that order because of EDX's special PO.