One of our clients typing unspeakeble words to our employees. He has psychological problems (really, he sent us his mental illness report too), he's obsessed with us unfortunately. We cant ban him with ip, reset his modem and come back, our own clients can't connect the chat, we cant ban him with visitor id too, he clean his cookies and browser, come back again. Our two women employee resigned, ım afraid there will be more. Device ban can be a solution, gaming companies doing this for cheaters, chat companies can do it for this kind of clients. Actually ı dont think its a common issue but, one man can turn our world to hell unfortunately.