I receive periodic calls from this number. Caller does not leave a voice mail and when I attempt to call back; message says this is not a working number

have called several times  a week but never left any messages. picked up the phone and asked to be remover from their call list. They said in order to do that they needed my full name and address then it would take up to 10 business days to remove our number.  did not give them any information.