How Do You Get COCK Out of CHACK?

So tonight our DVR was messed up. We called Mediacom and took turns waiting on hold (oh that music is annoying, but so is the repeated message every couple of minutes). Finally after almost an hour of being on hold, a lady gets on the phone. First the lady called Don Mr. Manhack. Okay, close. But then, she thanked Mr. Mancock. This is NOT the first time this has happened. He'd already said his name twice. But either way, how do you mispronounce our last name? I think it's a pretty easy name. Manchack. MAN-CHACK. Manchack. Easy. Oh man.