It is difficult to suggest anything to you since I do not find any legal question in what you have asked. What you are asking is how to avoid future fake cases. Generally speaking, it is not easy to stop someone from filing a fake case or true case, whatever, in future. You may have to fight such case on merits. Take common-sense precautions of avoiding contact with them. Or, better still, try to settle the issue with them once and for all. But, it is difficult to find a sure-shot formula that can avoid any future case against oneself.
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