Downvote the answer and, if it is grotesque enough, flag it.
The system will eventually answer ban him with enough downvotes on these low quality answers. Feel free to pop in to Root Access for help.
It may sound harsh, and obviously we want to try and educate the user and show him how a proper answer should be written, but at that volume it sounds like it needs to stop... We can always edit the answers for him and begin reversing downvotes, and incidentally this one way to lift the answer/question bans.
For more information, take a look at this: What can I do when getting "We are no longer accepting questions/answers from this account"?What can I do when getting "We are no longer accepting questions/answers from this account"?