Had a supplier steal our customer list!

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We stopped doing business in early January with a dropship supplier after it wanted a new agreement with a 25% reduction in our margin from two years ago and wanted us to agree not to sell any competitors products. We parted agreeably and the other day, it sent out an email soliciting the business of our customers.  The list would have come from fulfilling orders on behalf of our company. As a small operator - are we just screwed?