Who called from 6519980598

Just called, no message

Who does this # belong to? When calling back, line is busy..

I do not understand why would you call back an unknown number that did not leave you a message? Do you want more unknown calls?

Source on caller ID said the call came from St. Croix Lake Beach, MN.  It's a wild goose chase from there.  Probably a rental phone number, but call likely came from out of this country.

Left a message saying they can reduce interest rates on credit cards.