If you experience negative seo attacks against your site then being de-indexed by Bing/DDG at some point is to be expected. They are simply not as smart as Goog

If you experience negative seo attacks against your site then being de-indexed by Bing/DDG at some point is to be expected. They are simply not as smart as Google in this respect. You can go through the procedure of registering with their webmaster tools equivalent, submit a ticket and wait. Or you can simply just wait. In my limited experience (6 sites) the result was the same. Eventually it will resolve itself and you'll be back in the index, albeit with some very weird links showing up (an effect of the original attack). This does, at least, alert you to some vulnerabilities you may have previously been unaware of.