Pret Atma, Usually the non-competition contracts have time limitation. For example, if you are working for B as a consultant through company A, usually company A stipulates that you to not work for company B at least 1 year or whatever time stipulated in the contract. As per his post, it implies that he was working for B as a consultant through A and left company A to join B. This is clearly a violation of non-competition clause. Even though your contract might have expired a year ago, it may be effective for non-competition clause. That is why you need to talk to the lawyer.

As Dhoti_Prasad has said, if that company is doing illegal things, you can counter threaten them to shut them off. If you do not have those weapons, you could be in trouble. I would check with the lawyer. This is just my opinion. United7 bro, good luck to you.