The angry message: what to do in the first sixty seconds

In the first minute, speed matters more than wording. Acknowledge, own it, say what happens next and by when. The most common escalation is not caused by a bad reply - it is caused by twenty minutes of silence.

The order

1. Acknowledge the specific thing. "Your order was three days late and nobody told you" - not "sorry for any inconvenience".
2. Own it without diagnosing. "That is on us." You do not need to know why yet, and guessing wrong doubles the problem.
3. Say what happens next, with a time. This is the part that de-escalates. Vagueness is what makes people write again in capitals.
4. Give them a name. Somebody specific is now responsible.

What not to do

• Do not explain the internal cause. "Our supplier let us down" is not the customer's problem and reads as blame-shifting.
• Do not ask them to repeat themselves. Read the conversation first. Making somebody who is already angry retype their order number is an escalation you chose.
• Do not quote policy in the first reply. There may be a policy and it may apply; leading with it says the rules matter more than they do.
• Do not go quiet while you investigate. A holding message every twenty minutes costs nothing and is most of what they want.

When to hand it to somebody else

When the customer has asked for a manager, when money beyond the agent's authority is involved, or when the agent has become part of the argument. Hand it over with the context written down, so the customer never has to start again - which is the same discipline as a shift handover.

Afterwards

The recovery is worth more than the original service. A customer whose complaint was handled quickly and generously is more loyal than one who never had a problem - but only if the resolution actually lands. Follow up once, after, unprompted.