Use your .htaccess to ban these bad bots. But before you do this you need to find out if they are worthless.
Ban a single IP:
deny from “IP goes here”or
deny from “IP with /cidr”
or via user agent e.g short example.:
https://www.namepros.com/threads/unknown-bots-eating-up-my-valuable-bandwidth-how-to-stop.588889/