Or you might want to pay for a good VPN for a couple of months (so about £20).
I presume the DOSsers will give up if they can see you're connecting, but they can't grab your IP? Express VPN and Nord VPN are good places to start for gaming. After a few months cancel the VPN, and (hopefully) the short memories of these twerps will mean that you can then game without such problems.
I'm a Very Insightful Person, I'm here to share knowledge, I don't work for Virgin Media. Learn more
Have I helped? Click Mark as Helpful Answer or use Kudos to say thanks