https://phys.org/news/2019-02-year-old-facetime-bug-discovery-rattle.html

Not only that, but Grant and his mom said they spent a week unsuccessfully trying to get Apple to do something about the bug in its FaceTime group-chatting feature. The bug allowed callers to activate another person's microphone remotely even before the person has accepted or rejected the call.

"It took nine days for us to get a response," he said. "My mom contacted them almost every single day through email, calling, faxing." Of the fax, he jokes, "I'm not even sure what that is. It's probably older than I am."