it also says I know the messengers that can get a message to them
Sigh.
So what?
The
purpose of the feature is that you have an in with the criminal underbelly. You have that in via your contact, and you can get in touch with your contact wherever you are via your messengers. The messengers themselves are not actually important to the feature. Your contact is what's important, and even then, only so they can liaise with the criminal network.
You need someone to help you break into a bank? Your contact knows a guy.
You need some paperwork forged? Your contact knows a guy.
You need to buy or sell some illegal magic items or spell components? Your contact knows a guy.
You need to know the passwords the guards use? Your contact knows a guy.
You need to get in touch with the local underground rebellion? Your contact knows a guy.
This is the feature's purpose. To get you access (for a cost) to abilities you and your party lack. The messengers only exist so you can get in touch with your contact because instant forms of communication like cell phones are fairly rare in D&Dlandia. If you happened to get your hands on a pair of
sending stones and you give one to your contact, you wouldn't even
need a messenger.
The icing on the cake however is that the message will not reach the contact and all of this is just a ploy to get the criminal to do something the DPs want
That was
one possibility I gave.
One.
The Dark Powers may just want to set you up with a contact and then sit back and watch without interfering. The Dark Powers may not even be involved: It could actually be one of the zillions of monsters in Ravenloft who can overhear your conversations or read your mind and want to lure you in so they can eat your face, or it could be legitimate criminals (who overheard your conversation or read your mind) and who want a new person the Darklord's minions don't know. It could even be your actual contact, or a copy of your actual contact (the Dark Powers do that as well) who got brought into Ravenloft at some earlier point in time!
There are
dozens of possibilities here. Stop getting hung up on the part of the feature that is not actually important and focus on the part that is: getting in touch with a network of criminals.