I have been getting bombarded by calls from Credit One Bank despite being in the USA National Do Not Call Registry and despite having done no business whatsoever with this company. I filed a complaint with the Registry as they keep calling me from numbers all over the USA. Once I block one number they use another. I don't know whether the Registry can act upon my complaint or has any enforcement teeth. The Registry Complaint page says there may be smartphone apps that block unwanted calls. Do you know of any? That will block a company which after I block one number they call from another and another and another and I keep blocking and they keep calling from new numbers all over the USA, like a giant cancer of phone harassment. Enough with this harassment!