Board Thread:Support Requests - Community Management/@comment-26525672-20190604223545/@comment-37919779-20190605000005

To make it even harder for them, Take all their IP addresses, (You can see it via Special:BlockList on your wiki) and enter their IP's in here: https://tools.wmflabs.org/ip-range-calc/

It will give you a range, so you can block that IP range from editing on the wiki, and it will help keep them off!