Reward redemption. They call from several different numbers. Told them many times to put me on their do not call list. Sometimes, if I get through to an actual person I just sit there and let them listen to dead air.
This call to my cellphone ten damn times rhen called my f'n home phone every ten to fifteen minutes. I want something done right away. I am pressing charges.
Look for a blocking app. You'd essentially be pressing charges on thin air since you're doubtful to find out where the caller even is. For a landline and you don't risk any important calls, try disconnecting the line or shutting off the ringer.