Someone knocked on my door to offer landscape services, they call themselves "Landscapers LLC" (just an example, I do not want to put the actual name they used) and the paper ad they gave me also says "Landscapers LLC". They claimed to be a local business in Ohio (they even list a local PO Box as the address). They seemed a bit shady, so I called the Ohio Secretary of State and I was told there is no such business registered with them.
Is that business or person breaking any law? Can they operate/advertise as "Landscapers LLC" even though they did not register?