Two complaint e-mails sent to the CEO of AT&T, Randall Stephenson, were met with the threat of a cease-and-desist letter, says an upset customer. Giorgio Galante explains that he initially sent an e-mail asking for a change in his iPhone upgrade eligibility, on the assumption that service representatives can't adjust it, and that his $110 monthly phone bill might wield some influence. At the same time, he asked for a tethering option.