Ally Financial Inc., the auto and home lender, said the company was “embarrassed” that it used so-called robosigners to fill out foreclosure documents. “We screwed up,” chief executive officer Michael Carpenter, 63, said today during a conference call on third- quarter earnings for Detroit-based Ally. “We had a robosigner affidavit problem. No question about it. We’re embarrassed about it and we fixed it going forward.”