This varies state to state, but it’s likely that your LLC registration (including its members names) is public record. In that case, the state didn’t sell your info. Anyone can view that info and use it to contact you.
This sort of thing was rather startling to me when my wife and I bought our house. Apparently property sales are all public record where we live, so we started getting mail from random insurance companies within a month after moving.
The same thing you’d do if they were working in an office. How does being remote change this?