It's a debt collector.

I get a call once a week from this company:
(possible it is: Williams & Fudge http://www.wfcorp.com/ Phone: 1.800.849.9791 Fax: 1.803.329.0797 Postal Address: 300 Chatham Avenue, Rock Hill, SC 29731 Email: wf@wfcorp.com)
and each time the number changes:
8033262972
8033261408
8033261356
8033261423.
I think they bought old debt... when we got out new t-mobile phone, years ago,we got calls for some spanish lady who could not pay her bills, now it has started again only this people leave no message.

Constantly get calls during the day from this number. I do not answer.

called late hours re business