Threats from lifestyle legal

Hey guys so like lifestyle legal has been threatening to take me to court and blacklist me the say I owe them money which I have not signed anything to say that I owe them money alll I would like to know is how do I stop them from harrasing me with threats to go to court etc its getting a bit much I have tried making arrangements incase I did owe then money but I just keep getting the same emails so I honestly don't know what to do please can someone explain how to handle this thanks guy's