Who called from 2486237075

Caller left a message on my cell phone, said they had a solution for my credit card problems... (new to me...).  They left a toll free number (877) 723-1423.  When I tried their number (248) 623-7075, I got a no longer in service message...

I get several of the same calls every day on the switchboard.  I called the call back number - it was a debt consolidation type of place.  But I gave them a suggestion of putting an option at the end of the message to OPT-OUT.  They were very nice and agreed the suggestion would be good.  But the company doing the calling is not the company at the call back number.
I call that type of phone solicitation: SPAM.

Called my home phone - unwanted

Just called my cell, said hello and then disconnect.  I think it is wise to never call them back, could cause weird charges.

Called my cell.  I said hello, he said hello and then disconnect.