You have a few options depending on what exactly he is doing and what exactly you won a few years ago. ?If you previously obtained an order, or a settlement agreement, prohibiting the actions he is now doing, you could seek an order for contempt in the case of the court order or file an action for breach of agreement if there was a settlement. ?If some, or all, of his current actions are outside the scope of the previous resolution (you did not indicate if there was a court order or a settlement), then your best bet to stop him would be to seek an injunction.
You should consider contacting the attorney you previously used, assuming you used one, to discuss your options. ?If you did not use one, let me know. ?I can provide referrals.