What can I do if a moving company that I used threatened retaliation against me if I don't withdraw a complaint that I made with the BBB?

Question Details:

Movers who we recently used broke and lost some of our things, and possibly stole items as well. We filed a Better Business Bureau complaint, and the company owner called and threatened retaliation if I don't withdraw. He says I underpaid because he gave me the move at a very low price. I have a handwritten contract stating the amount he and I agreed that I would pay. It says that I paid him $1200 in cash, owing $550 cash at the end of the move, and I did pay (but no one gave me a receipt). Is there anything I should be worried about legally here? Can he sue me?

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