The spikes shall stop the day the fix was implemented, but Google Search Console is usually lagging a few days behind. This is why it seems like more and more pages are indexed.
You can check if the fix is working. Go to yourdomain.com/robots.txt and check, if Disallow: /wpm@ exists or not. If it doesn’t exist anymore, everything is correct.
You need to go into Search Console and go to Index → Pages → Indexed, although blocked by robots.txt file. You need to start a review on that page. You’ll probably need several runs to clear all the pages, but this is the fastest way to get them out of the index. Alternatively, you can also wait for Google to crawl these pages again, but this might need some time.