Who called from 3608189188

who is this calling me?
when i answer they hang up and when i call back its busy

I got this call twice today, and I called back and they hung up. No idea who it is.

this number called me twice today and when I picked up both times, they hung up right away.

Yeah I've gotten three more since then...
I'm really curious what the hell it's about.

I get that same number calling me like 3 or 4 times a day. I had on my cell bill someone buying stuff online and it came from my number, which i didn't purchase anything off my phone or online. Beware!