rang once on my cell phone and hung up.

rang once on my cell phone and hung up as well

I received many calls from this automated system.  Just call them back and you will have the option of being placed on their do not call list.
They said I had visited one of their internetsites and would receive a $100 thank you from my choice of stores.  I pressed num.2 to opt out of future callings.

I just received call from same number. Rang only one time, no message.

Please take this as good Samaritan advice:
1) never call back a company and reply to their "do not call" list as you just gave them verification to sell your number to other solicitors-scammers.
2) I got a call from them and never EVER give my phone number out, at least the one I got a call from them on,  to any site on the INTERNET... did I say ever?! So this should be proof they are lying about how the got your number since they know they are contacting people illegally in accordance to the National DO-NOT-CALL program. And this leads me to...
3) My number is on the Federal Government's DO-NOT-CALL list and since I got a call from them, having no legit business reason to call me, they are breaking the law - period!
Truly, my best wishes in these dealing moving forward.