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I have to agree with Bernadette. If it's a small handful of content, you might be better removing the pages altogether and redirecting the group to your top level blog page or your homepage. But if it's a large number of blog posts, it might be better to do an analysis of these blog posts. Even if you don't offer the service anymore, you don't necessarily want to remove a blog post that is generating a ton of organic traffic (and possible conversions!) to your website. Use GA to track the organic traffic and conversions, and use this data to determine which pages you should keep and optimize to have more relevant information about the services you do currently offer. This can also help you see which blogs are not worth keeping, and in that case you can remove them and set up the proper redirects. Good luck with the project!

Hi, Although I agree with Andy Drinkwater, yet I would still go ahead and disavow these links in time. It's the right thing to do, you never know if the next Google update starts looking at these spammy links as well. Always do the right thing first, don't wait for to react to the situation when it arrives. I hope this helps, feel free to respond if you have further questions. Best Regards, Vijay