I run a business, If I dont honor a written contract, or a contract is not honored to me, there are consequences, and I, or they will held accountable pretty quickly.
I also let properties, and it it a business, but Im not afforded the same protections when "things" go wrong, and they do. I accept that because I have to, not because I want to.
But Im experienced enough to know how to handle situations as they arise, other are not. I dont sweat the small stuff. They right thing to do here is return the deposit and stop acting as a one man crusade on principle, and feeling hard done by.
Its a minor issue being turned into a drama. Nothing to do with Karma,