No problem. I enjoy ending conversations with something along the lines of:

[Vyndree] Multiboxing isn't against the rules, but verbal harassment is. This is my final warning - please do not contact me again unless you have something constructive to say. Any further harassment and I will be forced to ticket a GM. Have a nice day.


If they continue, mark down the name of the harasser, the method (whisper/say/general chat/trade chat), and the server time that you sent your final warning message and include them in your ticket to the GM. Showing the GM that you did in fact warn the person to stop harassing you and they continued, and giving the GMs all the information they need, will greatly speed up the process. I've never had a repeat offender using this method.