Who called from 6123514872

Call left a voicemail of 8 seconds air...guessing an auto dial program glitch

i get a call from this number several times a day.  One time a person was there and I told him to take me off the list and never call again,but that didn't stop the calls

I don't know who calls me at this number, but they have called me multiple times without leaving a message.

I have received several calls from this number. One time I actually answered it and it was someone telling me it was about my credit card (without telling which one) and I could be eligible to lower my interest rate at which time I hung up.