Called my cell phone, no message. I called back from a restricted # and the lady answered "account services" So I'm guessing this is some type of collection call...?

I've had several calls from this number.  My caller ID says Sterling Jwlrs.  The voicemail they leave says something about calling an 800# and one of their service representatives will be able to help me.  Help me with what, I don't know.  I have NOT called the 800# or the number that shows up on caller ID.