Ebay Australia won’t help as a member sends rape threats and obscenities

The member has never bought anything from me and the abusive messages just came out of nowhereI am receiving violent and abusive emails from an eBay member here in Australia, but eBay shows no interest in helping me. This person has not bought an item from me – the emails started coming from nowhere to all three of my eBay accounts. I have sent 10 emails to eBay support about the user, but all it has done is restrict the number of messages that can be sent each day to three to each account