Is it Possible to increases DA 40 in just 30 days

One of my friends buy this service around 42 Dollar & recently I will check that my friend site da 35

He checked in Ahref but, seeing that the backlinks he made are just the same shows happening…

How this possible...

dont go for DA go for DR and reffering domain from ahrefs, much better
https://moz.com/learn/seo/domain-authorityhttps://www.blackhatworld.com/seo/doing-a-test-with-blasting-2-5mil-backlinks-on-my-website.1246934/