Who called from 9084289909

Text me by name saying that they haven't heard from me in while.  I replied, "who's this?".  They never text back.

I just got the same message; I'm not responding.

responded and now i don't know if i should have. Same scenario text saying its been a while

A text calling me by name & saying its been awhile... Who do I report this to?

I got the same text saying, "hi [name] you there?? Have not heard from you in a while."

I responded saying that I didn't know who it was and they responded with, "Lol if you want to know who this is u got to addd me on yahoo messenger, my name is textwoman44"