I had a taxi driver who charged me 43 shekel for a trip that should have been 20 shekel. It was on the meter, but I suspected that he turned on the meter before I got into the car (it was out of my sight). I asked to see the receipt, but he refused. He knew that I “busted” him. May I threaten him that if he does not give me the entire ride for free that I will report him to the Misrad Hatachbura (and they will cause him big problems)? To take this to an extreme, may I threaten him that if he does not give me 500 shekel, I will report him? I do have a right to report him— perhaps an obligation to help others, so he won’t intentionally dupe others. May I do this?
It sounds like nothing more than a suspicion, and in order for you not to pay him you have to make sure you are 100%, otherwise you are going to transgress 5 negative and one positive commandment, for stealing a worker’s pay ( if the driver is a Jew otherwise it will be less negative commandment, but still not permitted). By threatening the driver and therefore forcing him to allow you to steal from him is no different than any other form of stealing. Even if it is true that he tried stealing from you; that doesn’t give you the right to not pay him the wage that he is indeed entitled to. Besides, you cannot be moser him on a mere suspicion.
Babba Metzia 111a, CH:M 139-2, Ahavas Chesed 10-13, Nesiv Hachesed 26.