Google Search Console Audit & SEO Anomaly Fix

We need an experienced SEO professional to review our Google Search Console and help identify and resolve anomalies affecting our website’s performance.

The Issue:
Our Search Console reports over one million unindexed pages, even though our site only has around a hundred pages. Upon investigation, it appears that someone is linking to non-existent pages with our domain name, which seems to be negatively impacting our SEO.
What We Need:
1. Identify the source – Who is generating these links, and why?
2. Mitigate the damage – What actions can be taken to prevent this from harming our SEO?
3. Fix other SEO issues – Look for any additional factors that could be affecting our site’s search performance and resolve them.