I think you should warn Xmarkers to stay away from this guy. If you've given him opportunities to fix this and he hasn't, then I think you should share the name of his business.

That aside, what exactly was it that convinced you to do business with this particular person?

We've heard similar stories in the past and the common thread seems (to me) to be that the deceived were rooked in by "too low to be true" prices.

Was he highly recommended here on XMarks? Is he a partner or advertiser? Were there raving reviews of his work and customer service?