How do I handle Black Friday complaints?

As an e-commerce business owner, Black Friday can be incredibly stressful with potential customer service challenges. I'm worried about managing customer complaints effectively during this high-pressure sales period. My team needs a systematic approach to handle potential issues like shipping delays, stock shortages, discount misunderstandings, and customer frustrations without damaging our brand reputation. What strategies can help us proactively manage and resolve customer complaints during this critical sales event?