What to do if I receive a letter of Tortious Interference with Contract?

Question Details:

I received a letter of "Tortious Interference with Contract" from a law office representing Bose Corporation, - "in regard to issues related to your improper and tortious sale and commercial distribution of Bose products through Ebay." I buy and sell electronics products through Ebay for awhile now. Isn't that what Ebay is there for? What do I do? They want me to discontinue before 06/18/10.

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