@john32123666 Having tried the "I suggest..." type replies, to be honest, I'd just report it.
A "Requests are banned!" message from a Moderator carries a lot more weight. Mods are generally quite forgiving, for a first offence at least, but it puts commenters like these on the radar.
If they don't learn after a first or second warning, they'll get a temporary ban. And if they continue after that... well, I doubt I'd be that sorry to see them go. Whether or not we agree with any particular rule, we're morally obliged to abide by them if we also want the benefits.