Which one actually costs you more a support agent giving a wrong answer or a sales rep not knowing how to handle an objection? - I will not promote

Curious to hear from people who've seen both sides of this. When a support team (or support agent) gives a customer the wrong answer, wrong policy, or incorrect information, how much damage does it actually cause? Is it something that becomes obvious immediately through complaints and escalations, or does it quietly build up over time? On the sales side, when a sales rep or sales agent doesn't know how to handle a specific objection, competitor comparison, or customer question, do companies usually find out