Gutter cleaning dudes?

Ok just wanted an opinion on something that might not be anything. I am not a paranoid person...but this situation is just not sitting well with me.

So every month or so...some random dude shows up in my driveway with a ladder strapped to his car asking to clean my gutters. This usually occurs on Sunday afternoons. They usually come to the door and knock and I politely say "no thanks" and they move on down the street.

Well yesterday two guys in a car with ladder on top pull in front of my house knock on the door. I did not answer because we were out back with friends. I figured the guy would just go away. Well the guy then proceeds to come around to the back of the house, my dog goes nuts and I tell him no thanks. I take a look out front to see him back to his car then go back around back. As they leave the car has this very distinct grinding noise going on. 10 min later I hear the car coming back down the street the other way and they stop in front of the house again and this time the other guy comes directly to the back of the house and asks me the same thing. This time I say "really, no thanks" and he returns to the car. For the next 2 hours these guys run up and down my street stopping at every single house. After 5pm I never see them again.

At 3am. The dog woke me up to go outside and when I come back to bed. I hear this car come rolling down the street again. WTF.
Go back to sleep and just kind of forget about it.

So then today I head home for lunch and as I am leaving...the same fucking car comes down my street with a guy I have never seen before. Ladder on top the car.

Now like I said not paranoid usually, but this time...it just seems a bit odd that this same car is working my street two days in a row. I debated on calling Crime Stoppers or whatever, but did not as of yet.

Anyone with any experience like this? What would you do?