<i>&gt; You absolutely cannot ban a customer from your service</i><p>I guess that depends on the shop and the respect it grants its workers. In my case, at one company we would keep files about offenders and would report them to their managers, who would usually put someone else in charge of communicating with us. At another company we were simply told to cut them off, because tech support fees do not pay for abuse, end of story.<p>In most cases, any tech support contract worth at least four digits will involve too many people to be cut simply because of an individual hothead here or there, and in any case the wear this sort of bad customers put on your people is not worth whatever money is coming in. Managers who don&#x27;t understand this are not doing tech support, they are running a sweatshop and they should feel bad, and I am sorry if you met anyone like that.