I don’t think anyone is blaming you… just trying to figure out how to help.
At this point, is he’s not currently harassing you in game, there is nothing that SG can do. If the harassment is only thru WhatsApp, the issue needs to be handled with them. I don’t know that app well, but you can probably block him there.
If you block him there and he starts harassing you again here, THEN ask SG for help. Take screenshots of the harassment and report him immediately. Also, block him. Do exactly what he is using to track you - block him.