There is an endemic culture of not calling violations throughout DG worldwide, stance violations, time and probably courtesy are the prime culprits, and the move to a single person warning is part of trying to resolve that. If I can warn you on it myself, the rest of the card will be alert and available for seconding it in subsequent cases. Currently the first warning is typically one person seeing it and having an informal word, which I think lends itself to personal 1-2-1 conflict, and does nothing to alert the group to look for a formal infraction.
In terms of recourse you have the option of invoking 801.01 C, get a ruling or take a provisional if no official is available. False or tactical calling is cheating, and if the rest of your group supports you I would expect the TD to make that call.