Do you have a name for this "Thug" as this is what he is if your description is accurate. Is he licenced ? If your description of how he entered and stayed in your house is accurate he would probably be guilty of a criminal offence. He would have questions to answer under Data Protection if he discussed your debt with your father as you state. Cabott might also have questions to answer if this is the type of individual (as you describe) yhat they employ.