Who called from 2137020001

I got a call; it rang once and then hung up

Robo-call offering roof repair by filling a claim.  Probably a scam for those affected by tornado damage.

I just got it...two rings, I answer. Male-voiced speaker says, "Hello, This is Charlie calling from..." then the line goes dead.

Someone named Charlie about spots on roof ?

i got called by this number 8 time so finally i just blocked the number