[Alas, Natalia is unafraid of anything and his accusatory gaze is met just as evenly by her icy glare. She places her hands on her hips and tilts her chin upward faintly, showing no intention to back down at all.]

It is nothing. More certainly, nothing to raise your voice over.

Have enough dignity to ask for your money back and leave to go to a different establishment! You waste only your breath if you continue to berate this worker.