Don't get paranoid, they make their rounds every now and then to everybody.
You prob. were in panic mode, and just didn't notice them do the whole block.
Especially if you've only been there a short while, they wouldn't think twice about a new usage pattern.
Last month two clowns came and upgraded all the meters on my street one by one, and the only notice I got was them pounding on the door just as they were ready to do it-just a courtesy bang to let me know.
I made them wait for about 10 mins. while I shut down my computer n stuff, had a shot and a cig., then I told them go ahead.