A Comcast customer, identified only as "Oleg," successfully challenged the company's data meter, which appeared to show that he was using broadband even when he wasn't home. Comcast ultimately determined that someone had entered the customer's MAC address incorrectly, which meant that his meter was counting data used by another customer's modem. "Customers with less technical expertise than Oleg may not know how to challenge erroneous measurements or even suspect that they’re incorrect," ArsTechnica writes.