A two-person HVAC crew lost a repeat customer over a callback nobody wrote down

A friend runs a two-person HVAC repair business with his brother. Between calls, whoever picks up the phone is supposed to jot the job down in a shared notebook in the truck.

Last month a longtime customer called about a follow-up repair. His brother took the call between two jobs, said he would call back that afternoon, and meant it. Nothing got written down. No notebook, no text to himself, nothing.

Three weeks passed before my friend found out the customer had called someone else. Not because the work was bad. Because nobody called back and the customer assumed they were too busy to care.

The strange part is neither brother did anything wrong in the moment. Taking a call while driving to the next job and promising a callback is a completely reasonable thing to do. The problem is that promise only existed in one person's head for a few hours, and a few hours is plenty of time for a business to lose a client it did not even know it had.

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If you run a small crew like this, how many promises made mid-job are floating around right now that only exist in someone's memory?