Who called from 7818169982

This caller hangs up when you answer. Normally, I do not pick up numbers that do not advise you who they are, etc. However, I work from home and this could be a customer. But it is not. They just hang up. I put # in reject but do not know if this will help me avoid calls from those this number sells it to. One can only try since FCC FTC are not doing anything to stop these calls as they are employed to do...and demanded to take over!

They are soliciting a service.  They have young women call saying that they are interested in "the house for sale."  

" my name is Sarah calling to see if your house is still available for sale....."

And when you call back no answer