If what I understand is correct every time you can a particular number it comes back to your own device. Are you getting any other calls for this number on your phone or voice mail? Not sure exactly how this may have been arranged, but since it has to do with the other device redirecting the call there is little that you can do about it. The call is being rerouted through a service like Google voice. Have you tried to contact the person you are calling from a different phone or other means to find out why this might be happening?