Thanks for your concern. I started by filing a support ticket. The response was two-fold. It was my problem not theirs, but out of the goodness of their hearts they pointed me to an example of how I could block one particular IP address. Or any particular IP address, really, if I knew it in advance. 18 years ago, when the number of hostile actors connected to the internet was noticeably smaller, that might have been somewhat helpful. Not today.
Keep in mind, I know how to solve this problem on a server where I am root. But that solution would require occasional updates, and ‘temporary’ root access will not help.