Would this qualify as harrasment?

So my horde guild was going to raid ICC25 one night a month or few ago. We had a few people zone in, unluckily not our warlock. Three of our raiders had alliance alts who they had logged on and positioned outside of ICC and for about an hour ganked each member of the guild who was zoning in, no one else. After our raid leader and guild master had been informed who they really were they had been kicked from our guild. In time to come they have created dozens of alts to ask "Can you help me with a quest?" instantly after the group is formed, disconnect and log into the alliance character. And until possible escape gank and camp us over and over again. From the horde alts they've had we've been getting messages such as [removed] This has been going on since the ICC incident a month or few ago (can't remember how long it's been).

That night we had to cancel our raid because they wouldn't stop and leveling our alts has been limited to only when we don't see them (which myself I've had about 15 encounters in the past 10 days).