Identify
Someone else posed those same inquiries to me... It doesn't concern me that much, because I wasn't terribly interested in staying anonymous. But since the question has come up, I'll answer it:
"Someone from this site saw that cell number and ... called him???"
Answer: Yes. That is what my retailer said.
"...somehow your GM found that it was you who posted on this site??"
Short Answer: Yes.
"...how did he know it was you?"
Long Answer: I don't know exactly. I use 'ZandarKoad' for pretty much every single online account I have... So they could have made the connection from some other account. My Satellite guys profile doesn't have that information, but I am fairly certain that somewhere in my 350+ posts I've given out some rather specific details on myself. Someone might have gone through all my posts and done the research to find out who I am and who I work for. OR, someone kept tabs on every user and recorded such information when it was provided. Also, my signature has a Myspace link which contains some specific information...
I could ask my Retailer "how did they know it was me?" but that would give the impression that I was attempting to hide something. Also I don't care to give my Retailer any more headaches.

My Retailer probably doesn't even know or care either how they found out it was me.