Hello,
Thank you for posting your query.
There is no way of stopping a third person from raising a dispute or filing a case against you. You have mentioned that certain other persons had sold the above piece of land on the basis of false documents. In that case you may file a criminal complaint against that person for forgery and cheating. And also file a civil suit for cancellation of the sale deed.
In case your title of the land is clear, that you will eventually win before the court of law. But there is no shortcut procedure to cut down the legal hassle. Unless the parties mutually decide to settle the dispute. In such a situation you might have to part with certain piece of your land but eventually you might be able to resolve the dispute.
In order to do so, you need to draw up an agreement with the opposite side and then file the same before the competent civil court where the cases are pending.
Regards,