My Wordpress pages have been hacked

Job ID: 36119157

Budget: €12 – €18 EUR

The issue is described here: https://talk.plesk.com/threads/wordpress-hacked-unusual-plesk-behavior.365672/
There is some sophisticated background job that was injected to my WP. The WP toolkit of Plesk is not able to fix it - all the "bad" files I delete get created back instantly (Plesk is where my CMS is). More you can find in the url.
Please share your hourly rate on this and approx time estimate
Related categories: PHP Linux Web Security WordPress MySQL