1. Wish the prospect well and request a debrief, learning session
2. On the call, listen a LOT.. Re-articulate the prospect'd reasoning, and propose a hypothetical win scenario for your service. Get agreement.
4. Now you have 30-days to send the client valuable data/insights to create the buyers remorse
5. When you meet next, thank them for the earlier feedback, admit to your mea culpa moment. Tell them what you've fixed in your processes and that if the hypothetical win scenario can be relived. Stay hopeful and provide a simple migration path. I've seen miracles happen :-).
Sales reps are hustlers, in for the long haul. They train hard to roll with the punches and bounce back with a smile. But hey.. losing a new sales opportunity to a competitor stinks. Because it means you've wasted time and money on a deal that didn't close, at least for you.
What's much worse, though, is losing an existing customer to a competitor. In this case, you've wasted the time and effort to win the account AND the time and effort it took to keep them happy.