Like many others, I dropped from 1K to Gold yesterday, at least temporarily. As luck would have it I experienced a serious issue yesterday, when someone at UA decided to reroute me in the absence of any IRROPS problems or tight connections with my original flights (and in violation of the fare break at an airport that was bypassed). I only discovered this action when pulling out my mobile boarding pass enroute to board one of my original flights that was about to close. At that point it was too late for airport customer service to hold the flight. How to approach UA - presumably in writing?